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Title:
PRECURSORS FOR METAL ORGANIC CHEMICAL VAPOR DEPOSITION PROCESS (MOCVD) AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO/2014/060864
Kind Code:
A1
Abstract:
Disclosed is a compound of the general formula (I), wherein R1 represents a group selected from the list consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, linear or branched, saturated or mono- or polyunsaturated aliphatic carbon chain containing from two to ten carbon atoms, phenyl, and phenylacetylen, and wherein R2 and R3 independently of each other represent a group selected from the list consisting of C1, I, methyl, phenyl, or phenylacetylene.

Inventors:
GERLINGER, Wolfgang (Woogstraße 3, Limburgerhof, 67117, DE)
SACHWEH, Bernd (Großgasse 20a, Meckenheim, 67149, DE)
BRÄSE, Stefan (Maarstraße 38, Troisdorf, 53842, DE)
ENDERS, Mirja (Scheffelstraße 12, Karlsruhe, 76135, DE)
MÜLLER, Thierry (Füßlinstraße 6, Karlsruhe, 76131, DE)
KASPER, Gerhard (Marie-Baum-Straße 8, Karlsruhe, 76137, DE)
SEIPENBUSCH, Martin (Sebastianstraße 1, Karlsruhe, 76456, DE)
GAO, Kun (Gerwigstraße 1, Karlsruhe, 76131, DE)
FAUST, Matthias (Zähringerstraße 49, Karlsruhe, 76131, DE)
REICHENBACH, Linus (Heinrichsallee 39, Aachen, 52062, DE)
Application Number:
IB2013/058103
Publication Date:
April 24, 2014
Filing Date:
August 29, 2013
Export Citation:
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Assignee:
BASF SE (67056 Ludwigshafen, DE)
KARLSRUHER INSTITUT FÜR TECHNOLOGIE (KIT) (Kaiserstraße 12, Karlsruhe, 76131, DE)
BASF (CHINA) COMPANY LIMITED (300 Jiang Xin Sha Road, Pudong, Shanghai 7, 20013, CN)
International Classes:
C07F15/00; C23C16/18
Foreign References:
JPH08157490A
JPH1018036A
Attorney, Agent or Firm:
STILKENBÖHMER, Uwe et al. (Eisenführ Speiser, Patentanwälte Rechtsanwälte PartGmbBP.O. Box 10 60 78, Bremen, 28060, DE)
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Claims:
Claims:

Compound of the general formula (I)

wherein

R1 represents a group selected from the list consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, linear or branched, saturated or mono- or polyunsaturated aliphatic carbon chain containing from two to ten carbon atoms, phenyl, and phenylacetylen,

and wherein

R2 and R3 independently of each other represent a group selected from the list consisting of CI, I, methyl, phenyl, or phenylacetylene.

Compound according to claim 1 , wherein the substituents R2 and R3 are identical and each represents a group selected from the list consisting of CI, I, methyl, phenyl, or phenylacetylene.

Compound according to claim 1 , wherein the compound of the general formula (I) is a compound selected from the group consisting of dichlorido-r|4-((1Z,5Z)-1- methylcycloocta-1 ,5-dien) platinum, diiodido-n4-((1Z,5Z)-1-methylcycloocta-1 ,5- dien) platinum, dimethyl-n4-((1Z,5Z)-1-methylcycloocta-1 ,5-dien) platinum, η4- ((1Z,5Z)-1-methylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido-r|4-((1Z,5Z)-1- ethylcycloocta-1 ,5-dien) platinum, r)4-((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)diiodido platinum, n4-((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)dimethyl platinum, η4-((1Ζ,5Ζ)-1- ethylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido-r|4-((1 E,5Z)-1- phenylcycloocta- 1 , 5-d ien ) plati nu m , d iiod ido-n.4-(( 1 E , 5Z)- 1 -phenylcycloocta- 1 , 5- dien) platinum, dimethyl-n4-((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, diphenyl-n.4-((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, dichlorido-r|4-((1 E,5Z)- 1-isopropylcycloocta-1 ,5-dien) platinum, diiodido-n4-((1 E,5Z)-1-lsopropylcycloocta- 1 ,5-dien) platinum, r|4-((1 E,5Z)-1-isopropylcycloocta-1 ,5-dien)dimethyl platinum, H4-((1Z,5Z)-1-isopropylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido-r|4-((1 E,5Z)- 1-n-butylcycloocta-1 ,5-dien) platinum, diiodido-n4-((1 E,5Z)-1-n-butylcycloocta-1 ,5- dien) platinum, dimethyl-n4-((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum, diphenyl-n.4-((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum, dichlorido-n.4-((1 E,5Z)- 1 -iso-butylcycloocta- 1 , 5-d ien ) platin u m , di iod ido-n.4-(( 1 E , 5Z)- 1 -iso-bu tylcycloocta- 1 ,5-dien) platinum, dimethyl-n4-((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, diphenyl-n.4-((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, dichlorido-η4- ((1 E,5Z)-1-n-hexylcycloocta-1 ,5-diene) platinum, diiodido-n.4-((1 E,5Z)-1-n- hexylcycloocta-1 ,5-diene) platinum, and n.4-((1 E,5Z)-1-n-hexylcycloocta-1 ,5- diene)dimethylplatinum.

Use of a compound according to any of claims 1 to 3 as a precursor in a metal organic chemical vapor deposition process for depositing platinum onto a substrate.

The use according to claim 4, wherein the substrate consists of or comprises (a) one or more oxides selected from the group consisting of Si02, MgO, Al203, Ti02, Zr02, Y203, Cr203, La203, Fe203, ZnO, and SnO and/or (b) one or more mixed oxides of two, three or more oxides selected from the group consisting of Si02, MgO, Al203, Ti02, Zr02, Y203, Cr203, La203, Fe203, ZnO, and SnO.

The use according to claim 4 or 5, wherein the substrate is constituted by an amount of particles having an average Feret diameter in the range of from 12 to 300 nm, preferably in the range of from 25 to 200 nm, more preferably in the range of from 40 to 100 nm.

The use according to claim 6, wherein the substrate is constituted by or comprises an amount of particles selected from the group consisting of cylindrical, discoidal, tabular, ellipsoidal, equant, irregular, and spherical particles, preferably spherical particles.

The use according to any of claims 4 to 7, in a metal organic chemical vapor deposition process for depositing one or more platinum dots onto a substrate.

The use according to claim 8, wherein at least some of the platinum dots deposited on the substrate have a mean Feret diameter below 10 nm, preferably in the range of from 0.5 to 8 nm, more preferably in the range of from 1 to 4 nm.

10. The use according to claim 8 or 9, wherein at least 90 % of those platinum dots having a minimum mean Feret diameter of 1 nm have a mean Feret diameter in the range of from 1 to 4 nm.

1 1. The use according to any of claims 4 to 10, wherein the metal organic chemical vapor deposition process is at least partly or completely performed under a pressure in the range of from 1 mbar to 2000 mbar, preferably in the range of from 500 mbar to 1500 mbar, more preferably in the range of from 900 mbar to 1200 mbar.

12. A method for depositing platinum onto a substrate comprising the following step:

contacting a compound of formula (I) according to any of claims 1 to 3 with a substrate under conditions in which the compound of formula (I) decomposes into metallic platinum.

13. A product comprising or consisting of an amount of particles having platinum dots on their surface,

wherein the particles having platinum dots on their surface without consideration of the platinum dots have a mean Feret diameter in the range of from 12 to 300 nm, preferably in the range of from 25 to 200 nm, more preferably in the range of from 40 to 100 nm, and

wherein the platinum dots have a mean Feret diameter below 10 nm, preferably in the range of from 0.5 to 8 nm, more preferably in the range of from 1 to 4 nm. 14. A product according to claim 13, wherein at least 90 % of those platinum dots having a minimum diameter of 1 nm have a diameter in the range of from 1 to 4 nm.

15. A product according to claim 13 or 14, wherein the particles have at least 1 dot per 100 nm2, preferably at least 4 dots per 100 nm2, more preferably at least 6 dots per 100 nm2 of the particle surface.

16. A product according to claim 13 or 15, wherein the substrate consists of or comprises (a) one or more oxides selected from the group consisting of Si02, MgO, Al203, Ti02, Zr02, Y203, Cr203, La203, Fe203, ZnO, and SnO and/or (b) one or more mixed oxides of two, three or more oxides selected from the group consisting of Si02, MgO, Al203, Ti02, Zr02, Y203, Cr203, La203, Fe203, ZnO, and SnO.

17. A product according to any of claims 13 to 16, wherein the substrate having one or more platinum dots on its surface is obtainable by a metal organic chemical vapor deposition process.

18. A product according to claim 17, wherein the substrate having one or more platinum dots on its surface is obtainable by a metal organic chemical vapor deposition process, wherein a compound of formula (I) according to any of claims 1 to 3 is used as precursor to form the platinum dot(s) and/or the metal organic chemical vapor deposition process is performed according to the method of claim 12.

19. A catalyst system, preferably a catalyst system in a catalytic converter or for asymmetric hydrogenation, comprising or consisting of a product according to any of claims 13 to 18.

20. Use of a product according to any of claims 13 to 18 as a catalyst, preferably as catalyst in a catalytic converter or for asymmetric hydrogenation.

Description:
Precursors for the metal organic chemical vapor deposition process (MOCVD), and their use

The present invention relates to a compound of the general formula (I)

and a use of the compound as a precursor in a metal organic chemical vapor deposition process (MOCVD) for depositing platinum onto a substrate, a method of depositing platinum onto a substrate, and a substrate having one or more platinum dots on its surface. The invention further relates to a catalyst system comprising or consisting of a substrate having one or more platinum dots its surface, and a use of a substrate having one or more platinum dots on its surface as a catalyst system.

Further aspects and advantages of the present invention will become apparent from the ensuing description including the examples and the figures as well as from the enclosed patent claims.

The CVD (chemical vapor deposition) process is known as a coating method. It is among the most important processes in thin film technology. The CVD process is mainly used in the production of functional materials such as optical waveguides, insulators, semicon- ductors, conductor strips and layers of hard materials. In this process, molecular precur- sors transported in the gas phase react on hot surfaces in the reactor to form adherent coatings. Gas phase methods derived from metal organic chemical vapor deposition (MOCVD) have been used for the synthesis of catalysts, and show certain advantages since interfering salts and stabilizers are not present. Overviews of the principle and applications of the CVD technique may be found, for example, in the following references: A. Fischer, Chemie in unserer Zeit 1995, 29, No. 3, pp. 141-152; Weber, Spektrum der Wissenschaft, April 1996, 86-90; L. Hitchman, K. F. Jensen, Acad. Press, New York, 1993 and M. J. Hampden-smith, T. T. Kodas, The Chemistry of Metal CVD, VCH, Weinheim, 1994. The principle of MOCVD is that of vaporizing a volatile precursor of the metal, namely an organometallic complex, which decomposes thermally on the substrate to form a metallic layer. In practice, the vaporization takes place under pressure and temperature conditions that make it possible to obtain a sufficient precursor vapor pressure for the deposit, while at the same time the precursor remains within its stability range. As regards the substrate, it is heated beyond this stability range, which allows decomposition of the organometallic complex and the formation of metal particles. The MOCVD deposition method has various advantages over other known methods: the thermolysis temperature in MOCVD is typically 1000 to 2000 K lower than for other vapor deposition techniques not using organometallic complexes. The films obtained with MOCVD are dense and usually continu- ous. E.g., in contrast with liquid impregnation methods, MOCVD is rapid, and impregnation, washing, drying, purification and activation steps are avoided. Poisoning of the surface of the deposited layer, and modifications of the product during drying are also avoided. MOCVD is thus a controllable, rapid and economical method for obtaining high quality metal layers on a substrate. Various organometallic platinum compounds, i.e. complexes containing platinum and organic ligands, are currently widely used. Examples are: Pt(acac) 2 , Pt(PF 3 ) 4 , (COD)PtMe 2 , MeCpPtMe 3 and EtCpPtMe 3 .

JP 08-157490 A discloses the use of diethyl-n. 4 -(1 ,5-dimethylcycloocta-1 ,5-dien) platinum and diethyl-n 4 -(1 ,6-dimethylcycloocta-1 ,5-dien) platinum as precursors for use in the metal organic chemical vapor deposition method (MOCVD method). The organometallic precursors are used for the formation of thin platinum films which are useful as an electrode for dielectric memories of a semiconductor device. The 1 ,5-cyclooctadien ligand of the described compounds contains two substituents and therefore the precursor possesses a high symmetry.

JP 10-018036 A discloses the use of diethyl-n. 4 -(1 ,5-dimethylcycloocta-1 ,5-dien) platinum and diethyl-n 4 -(1 ,6-dimethylcycloocta-1 ,5-dien) platinum as a precursor for the metal organic chemical vapor deposition method (MOCVD method). The precursors are dissolved in an organic solvent and the solution is used in the MOCVD process. The precursors are used for the formation of thin platinum films which can be used for contacts, wiring, etc. of semiconductor devices.

US 201 1/0294672 A1 and WO 2010/081959 A2 disclose the use of platinum precursors with norbornadiene or norbornadiene derivatives being used as a ligand (eg. dimethyl-η 4 - (7-methyl- norbornadiene) platinum or dimethyl-r| 4 -norbornadiene platinum). The described precursors are used in a metal organic chemical vapor deposition process (MOCVD process) for the manufacture of a platinum film or dispersion. The films can be used in electronic devices or as catalysts. WO 03/106734 A2 discloses the use of bis-(perfluoropropyl)-1 ,5-cyclooctadiene platinum as photosensitive organometallic compounds which are used in the production of metal deposits. Using the described compounds substantially continuous thin 'sheet-like' films or substantially narrow lines can be obtained, which possess electrical conductivity.

The possibility of forming a satisfactory metallic deposit via the MOCVD method depends on the volatility of the organometallic (precursor) compound. Specifically, MOCVD requires the possibility of obtaining both a high vapor pressure and high stability of the precursor compound. An organometallic platinum (precursor) compound for use in the MOCVD process

should have a good volatility,

- a good thermal stability during its evaporation and transport in the gas phase, a high purity (or it should be readily purifyable),

it should decompose cleanly on pyrolysis without contamination of the growing film (e.g. by carbon),

it should be non-toxic, non-pyrophoric, not-corrosive

- readily available in consistent quality and quantities at low cost, and it should be stable in its container over a long period.

One particularly interesting application of platinum precursors (organometallic platinum compound) is the preparation of platinum catalysts by metal organic chemical vapor deposition. Platinum catalysts can be used, for example, in automobiles as catalytic converters, which allow for the complete combustion of remaining low concentrations of unburned hydrocarbons in the exhaust gas mixture into carbon dioxide and water vapor, or other reduction/oxidation reactions. Platinum is also used in the petroleum industry as a catalyst in a number of separate processes, but especially in catalytic reforming of straight run naphthas into higher-octane gasoline.

Triggered by the ever rising prices of platinum several ways were found to increase the activity of platinum catalyst and/or to decrease the amount of platinum used for the production of catalyst. One approach is to deposit a particularly thin platinum film on a substrate. Thus, the ratio between the active platinum surface and the used platinum is improved. This ratio can be improved even further, if small platinum dots instead of a continuous platinum film are deposited on the surface of the substrate.

A primary problem to be solved by the present invention was to provide a platinum precursor for the MOCVD process which allows for the formation of platinum on a surface, especially the formation of platinum dots on a surface, and which shows at the same time one or more of the abovementioned positive properties for MOCVD precursors, especially a good volatility and a good thermal stability during its evaporation and transport in the gas phase. Preferably, the platinum dots on the surface (preferably additionally) exhibit a high dispersion, more preferably in the range of from 20 to 60 percent (see below for more details regarding "dispersion"). Even more preferably the platinum dots on the surface of Al 2 0 3 (preferably additionally) exhibit a high dispersion, preferably in the range of from 55 to 60 percent. According to the invention, the primary problem is solved with a compound of the formula

(I)

wherein R1 represents a group selected from the list consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, linear or branched, saturated or mono- or polyunsaturated aliphatic carbon chain containing from two to ten carbon atoms, phenyl, and phenylacetylen, and wherein R2 and R3 independently of each other represent a group selected from the list consisting of CI, I, methyl, phenyl, or phenylacetylene. While not wishing to be bound by any particular theory, it is presently believed that the asymmetry of the compound of the general formula (I), which is the consequence of the monosubstitution of the 1 ,5-cycloctadien-ligand, the order of the resulting platinum complex in the liquid phase or the crystal is reduced and the volatility of the precursor is increased, compared with symmetric platinum complexes having an otherwise similar structure (e.g. compounds with disubstituted or unsubstituted 1 ,5-cycloctadien-ligands). Surprisingly, the thermal stability of the compounds of the present invention is still very good.

If in a compound of formula (I) the substituents R2 and R3 are identical the compound of formula (I) is available in consistent quality and quantities at low cost, because the syn- thesis can be conducted in a particularly effective manner.

Thus, preferably, in the compound according to the invention the substituents R2 and R3 are identical and each represent a group selected from the list consisting of CI, I, methyl, phenyl, or phenylacetylene.

More preferably, in the compound according to the invention each of the substituents R2 and R3 represents a methyl group. The compounds of the present invention can be readily evaporated or sublimated at low temperatures, and release the platinum at moderately increased temperature while at the same time the organic ligands of the organometallic compounds rapidly evaporate.

A compound of the present invention is especially preferred which is a compound selected from the group consisting of

dichlorido-n 4 -((1Z,5Z)-1-methylcycloocta-1 ,5-dien) platinum,

diiodido-n 4 -((1Z,5Z)-1-methylcycloocta-1 ,5-dien) platinum,

dimethyl-n 4 -((1Z,5Z)-1-methylcycloocta-1 ,5-dien) platinum,

H 4 -((1Z,5Z)-1-methylcycloocta-1 ,5-dien)diphenyl platinum,

dichlorido-n 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien) platinum,

n. 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)diiodido platinum,

n. 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)dimethyl platinum,

n. 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)diphenyl platinum,

dichlorido-r| 4 -((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum,

diiodido-n. 4 -((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum,

dimethyl-n. 4 -((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum,

diphenyl-n. 4 -((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum,

dichlorido-r| 4 -((1 E,5Z)-1-isopropylcycloocta-1 ,5-dien) platinum,

diiodido-r| 4 -((1 E,5Z)-1-lsopropylcycloocta-1 ,5-dien) platinum,

r) 4 -((1 E,5Z)-1-isopropylcycloocta-1 ,5-dien)dimethyl platinum,

r) 4 -((1Z,5Z)-1-isopropylcycloocta-1 ,5-dien)diphenyl platinum,

dichlorido-r| 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum,

diiodido-r| 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum,

dimethyl-n. 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum,

diphenyl-n. 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum,

dichlorido-r| 4 -((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum,

diiodido-r| 4 -((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum,

dimethyl-r| 4 -((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, diphenyl-r| 4 -((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, dichlorido-r| 4 -((1 E,5Z)-1-n-hexylcycloocta-1 ,5-diene) platinum,

diiodido-r| 4 -((1 E,5Z)-1-n-hexylcycloocta-1 ,5-diene) platinum, and

H 4 -((1 E,5Z)-1-n-hexylcycloocta-1 ,5-diene)dimethylplatinum

preferably preferred selected from the group consisting of

dimethyl-n. 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum,

dimethyl-n. 4 -((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum,

H 4 -((1 E,5Z)-1-n-hexylcycloocta-1 ,5-diene)dimethylplatinum, and

dimethyl-r| 4 -((1 Z,5Z)-1-ethylcycloocta-1 ,5-dien)-platinum. The invention relates also to the use of a compound of the invention (preferably a compound a defined hereinabove as preferred) as a precursor in a metal organic chemical vapor deposition process for depositing platinum onto a substrate. The resulting products (substrates having platinum deposited on their surface) can be used as catalysts, see below for a more detailed discussion. While not wishing to be bound by any theory, it is believed that a MOCVD process for depositing platinum onto a substrate when using a compound of the present invention consists of the following steps:

Transfer of the precursor (compound of the present invention) into a carrier gas stream, usually by sublimation of the precursor

- Transport of the precursor to the substrate

Adsorption of the precursor and/or chemisorption of the precursor on functional groups (e.g. hydroxyl, carbonyl or amino groups) on the surface of the substrate

Cleavage of the volatile ligands from the precursor, and release of platinum from the precursor,

- Desorption of the ligands from the surface of the substrate

Structural growth and/or layer growth by surface diffusion of the platinum and/or autocatalysis so that platinum is finally deposited onto the substrate.

It is furthermore believed that during these steps the precursors are adsorbed on the surface of the substrate and interact with oxygen that is also adsorbed on the surface of the substrate. Afterwards the precursor decomposes and releases platinum, gaseous hydrocarbons (e.g. CH 4 ), C0 2 and water. The formed Pt and Pt-0 clusters on the surface of the substrate are already catalytically active and catalyze the decomposition and coating process, leading to the formation of molecular platinum near the cluster. An abundance of materials may be used as a substrate. In own investigations, it has been shown that some substrate materials have particularly good properties. Thus the use according to the invention is especially preferred where the substrate consists of or comprises (a) one or more oxides selected from the group consisting of Si0 2 , MgO, Al 2 0 3 , Ti0 2 , Zr0 2 , Y2O3, Cr 2 0 3 , La 2 0 3 , Fe 2 0 3 , ZnO, and SnO and/or (b) one or more mixed oxides of two, three or more oxides selected from the group consisting of Si0 2 , MgO, Al 2 0 3 , Ti0 2 , Zr0 2 , Y 2 0 3 , Cr 2 0 3 , La 2 0 3, Fe 2 0 3 , ZnO, and SnO.

The use of a compound of the present invention as a precursor in a metal organic chemical vapor deposition process for depositing platinum onto a substrate is preferably used for the production of heterogeneous catalysts. Typically, such catalysts have a very high reaction rate if the surface area of the substrate is large, as the platinum is then deposited and distributed on a large (substrate) surface. The smaller the substrate particle size, the larger the surface area for a given mass of substrate particles. Thus, the use according to the invention is especially preferred wherein the substrate is constituted by an amount of particles having an average diameter in the range of from 12 to 300 nm as determined by laser diffraction analysis or having an average Feret diameter in the range of from 12 to 300 nm, preferably in the range of from 25 to 200 nm, more preferably in the range of from 40 to 100 nm.

For identifying the "Mean Feret diameter" of an individual particle a (two-dimensional) TEM photography is prepared. The Feret diameter (caliper diameter) is the averaged distance between pairs of parallel tangents to the projected outline of the particle. The "Mean Feret diameter" is calculated after consideration of all possible orientations. The Feret diameters for a sufficient number of angles are measured, and their average is calculated.

For identifying the "Average Feret diameter" of an amount of particles a (two-dimensional) TEM photography of an amount of particles is prepared. The "Mean Feret diameter" for each individual particle in the TEM photography is determined, and their average is calculated. The use according to the invention is especially preferred where the substrate is constituted by or comprises an amount of particles selected from the group consisting of cylindrical, discoidal, tabular, ellipsoidal, equant, irregular, and spherical particles, preferably spherical particles. Within the present text, in particular particles with a sphericity of more than 0.9 are considered as spherical particles. The "sphericity" is the ratio of the perimeter of the equivalent circle (circle that has the same area as the projection area of the particle) to the real perimeter of the projection of the particle. The result is a value between 0 and 1. The smaller the value, the more irregular is the shape of the particle. This results from the fact that an irregular shape causes an increase of the real perimeter. The ratio is always based on the perimeter of the equivalent circle because this is the smallest possible perimeter with a given projection area. For identifying the sphericity of a particle a (two- dimensional) TEM photography of the particle is prepared.

Surprisingly, own investigations have shown that the precursors according to the inven- tion are particularly well suited for the deposition of platinum dots onto a substrate. The use according to the invention is especially preferred in a metal organic chemical vapor deposition process for depositing one or more platinum dots onto a substrate.

In the context of this text a platinum dot is understood to be a platinum island on the surface of a substrate, the island having a mean Feret diameter of more than 0.1 nm. Accumulations of platinum having a mean Feret diameter of less than 0.1 nm (e.g. isolated platinum atoms on a substrate) are not considered as platinum dots. Platinum dots can be substantially flat (e.g. a monolayer of platinum on the substrate) or can possess a three-dimensional shape, like, e.g., a platinum dot having convexity. For identifying the mean Feret diameter of a dot a (two-dimensional) TEM photography is prepared and the mean Feret diameter is determined as described above. For identifying the "Average Feret diameter" of an amount of dots a (two-dimensional) TEM photography of an amount of dots is prepared. The "Mean Feret diameter" for each individual dot in the TEM photography is determined, and their average is calculated.

Preferred is the use of a compound of the present invention (as defined above, preferably as hereinabove characterized as being preferred) as a precursor in a metal organic chemical vapor deposition process for depositing platinum dots onto a substrate, wherein the substrate is constituted by an amount of particles having an average Feret diameter in the range of from 12 to 300 nm, preferably in the range of from 25 to 200 nm, more preferably in the range of from 40 to 100 nm, and

wherein the substrate consists of or comprises spherical particles consisting of or com- prising (a) one or more oxides selected from the group consisting of Si0 2 , MgO, Al 2 0 3 , Ti0 2 , Zr0 2 , Y 2 0 3 , Cr 2 0 3 , Na 2 0, La 2 0 3 , Fe 2 0 3 , ZnO, and SnO and/or (b) one or more mixed oxides of two, three or more oxides selected from the group consisting of Si0 2 , MgO, Al 2 0 3 , Ti0 2 , Zr0 2 , Y 2 0 3 , Cr 2 0 3 , Na 2 0, La 2 0 3, Fe 2 0 3 , ZnO, and SnO.

Also preferred is the use of a compound according to the present invention (as defined above, preferably as hereinabove characterized as being preferred) as a precursor in a metal organic chemical vapor deposition process for depositing platinum dots onto a substrate,

wherein the substrate is constituted by an amount of particles having an average Feret diameter in the range of from 10 to 300 nm, and

wherein the substrate consists of spherical particles consisting of (a) one or more oxides selected from the group consisting of Si0 2 , Al 2 0 3 , Ti0 2 , Fe 2 0 3 , ZnO, and SnO and/or (b) one or more mixed oxides of two, three or more oxides selected from the group consisting of Si0 2 , Al 2 0 3 , Ti0 2 , Fe 2 0 3 , ZnO, and SnO.

Surprisingly, own investigations have shown that in the use according to the invention platinum dots can be deposited having a narrow size distribution and a small dot diameter. The use according to the invention is preferred where at least some of the platinum dots deposited on the substrate have a mean Feret diameter below 10 nm, preferably in the range of from 0.5 to 8 nm, more preferably in the range of from 1 to 4 nm.

Preferred is the use of a compound according to the present invention (as defined above, preferably as hereinabove characterized as being preferred) as a precursor in a metal organic chemical vapor deposition process for depositing platinum dots onto a substrate, wherein the substrate consists of spherical particles consisting of (a) one or more oxides selected from the group consisting of Si0 2 , Al 2 0 3 , Ti0 2 , Fe 2 0 3 , ZnO, and SnO and/or (b) one or more mixed oxides of two, three or more oxides selected from the group consist- ing of Si0 2 , Al 2 0 3 , Ti0 2 , Fe 2 0 3 , ZnO, and SnO, wherein at least some of the platinum dot(s) deposited on the substrate have a mean Feret diameter below 10 nm, preferably in the range of from 0.5 to 8 nm, more preferably in the range of from 1 to 4 nm, and

wherein preferably the substrate is constituted by an amount of particles having a aver- age Feret diameter in the range of from 10 to 300 nm.

The use according to the invention is especially preferred where at least 90 % of those platinum dots having a minimum mean Feret diameter of 1 nm have a mean Feret diameter in the range of from 1 to 4 nm.

The use according to the invention is especially preferred, wherein at least 90 % of the platinum dots have a mean Feret diameter in the range of from 70 % to 130 %, preferably 80 % to 120 %, more preferably 90 % to 1 10 %, of the average Feret diameter of the platinum dots.

Due to the high volatility and high stability of the compound of the present invention it is possible to use these compounds in MOCVD processes performed under atmospheric pressure. The use according to the invention is especially preferred where the metal organic chemical vapor deposition process is at least partly or completely performed under a pressure in the range of from 1 mbar to 2000 mbar, preferably in the range of from 500 mbar to 1500 mbar, more preferably in the range of from 900 mbar to 1200 mbar. The use according to the invention is especially preferred where the MOCVD process is performed in a continuous gas-phase or in a fluidized bed.

The invention also relates to a method for depositing platinum onto a substrate comprising the following step:

contacting a compound of formula (I) according to the present invention with a substrate under conditions in which the compound of formula (I) decomposes into metallic platinum.

The method of the present invention is closely related to the use of the present invention. Thus, preferred embodiments of the use of the invention as discussed above correspond to preferred embodiments of the method of the present invention. The products of the method of the present invention (substrates having platinum deposited on their surface) can be used as catalysts, see below for a more detailed discussion.

Thus, a method of the present invention is preferred wherein the substrate consists of or comprises (a) one or more oxides selected from the group consisting of Si0 2 , MgO, Al 2 0 3 , Ti0 2 , Zr0 2 , Y2O3, Cr 2 0 3 , La 2 0 3 , Fe 2 0 3 , ZnO, and SnO and/or (b) one or more mixed oxides of two, three or more oxides selected from the group consisting of Si0 2 , MgO, Al 2 0 3 , Ti0 2 , Zr0 2 , Y 2 0 3 , Cr 2 0 3 , La 2 0 3, Fe 2 0 3 , ZnO, and SnO.

Furthermore, a method of the present invention is preferred wherein the substrate is constituted by an amount of particles having an average Feret diameter in the range of from 12 to 300 nm, preferably in the range of from 25 to 200 nm, more preferably in the range of from 40 to 100 nm.

Even further, a method of the present invention is preferred wherein the substrate is constituted by or comprises an amount of particles selected from the group consisting of cylindrical, discoidal, tabular, ellipsoidal, equant, irregular, and spherical particles, prefer- ably spherical particles. See above for further discussions and definitions.

A method of the present invention is preferred wherein contacting the compound of formula (I) of the present invention with a substrate is performed during a metal organic chemical vapor deposition process so that platinum dots are prepared on the surface of the substrate. I.e., the compound of formula (I) of the present invention is contacted with the substrate so that platinum dots (rather than a continuous platinum film) are prepared on the surface of the substrate.

A method of the present invention is especially preferred, wherein at least some of the platinum dots deposited on the substrate have a mean Feret diameter below 10 nm, preferably in the range of from 0.5 to 8 nm, more preferably in the range of from 1 to 4 nm.

A method of the present invention is especially preferred, wherein at least 90 % of the platinum dots deposited on the substrate have a mean Feret diameter in the range of from 70 % to 130 %, preferably 80 % to 120 %, more preferably 90 % to 1 10 %, of the average Feret diameter of the platinum dots. A method of the present invention is especially preferred wherein the method is at least partly or completely performed under a pressure in the range of from 1 mbar to 2000 mbar, preferably in the range of from 500 mbar to 1500 mbar, more preferably in the range of from 900 mbar to 1200 mbar. Features of preferred embodiments of the method of the present invention are preferably combined to particularly preferred embodiments.

Particularly preferred is a method of the present invention (as defined above, preferably as hereinabove characterized as being preferred)

wherein contacting the compound of formula (I) according to the invention with the sub- strate is performed during a metal organic chemical vapor deposition process so that platinum dots are prepared on the surface of the substrate,

wherein at least some of the platinum dots deposited on the substrate have a mean Feret diameter in the range of from 1 to 4 nm,

wherein the method is at least partly or completely performed under a pressure in the range of from 900 mbar to 1200 mbar.

Very preferred is a method according to the present invention (as defined above, preferably as hereinabove characterized as being preferred)

wherein contacting the compound of formula (I) according to the invention with the substrate is performed during a metal organic chemical vapor deposition process so that platinum dots are prepared on the surface of the substrate,

wherein at least some of the platinum dots deposited on the substrate have a mean Feret diameter in the range of from 1 to 4 nm,

wherein the substrate consists of or comprises (a) one or more oxides selected from the group consisting of Si0 2 , MgO, Al 2 0 3 , Ti0 2 , Zr0 2 , Y 2 0 3 , Cr 2 0 3 , La 2 0 3 , Fe 2 0 3 , ZnO, and SnO and/or (b) one or more mixed oxides of two, three or more oxides selected from the group consisting of Si0 2 , MgO, Al 2 0 3 , Ti0 2 , Zr0 2 , Y 2 0 3 , Cr 2 0 3 , La 2 0 3, Fe 2 0 3 , ZnO, and SnO,

wherein the substrate is constituted by an amount of spherical particles having an average Feret diameter in the range of from 40 to 100 nm, and

wherein the method is at least partly or completely performed under a pressure in the range of from 900 mbar to 1200 mbar. The invention also relates to a product comprising or consisting of an amount of particles (of substrate material) having platinum dots on their surface,

wherein the particles having platinum dots on their surface without consideration of the platinum dots have a average Feret diameter in the range of from 12 to 300 nm, prefera- bly in the range of from 25 to 200 nm, more preferably in the range of from 40 to 100 nm, and

wherein the platinum dots have a mean Feret diameter below 10 nm, preferably in the range of from 0.5 to 8 nm, more preferably in the range of from 1 to 4 nm.

The respective Feret diameter of the substrate (average Feret diameter) and the platinum dots (mean Feret diameter) are determined as described above. The product of the present invention (amount of particles having platinum dots on their surface) can be used as a catalyst or as catalytically active component of catalyst system. The product is characterized by a high activity corresponding to a large platinum surface area achieved with a low mass of platinum deposited (i.e. the ratio of platinum surface area to platinum mass deposited is particularly favorable).

A product according to the invention, wherein at least 90 % of those platinum dots having a minimum mean Feret diameter of 1 nm have a mean Feret diameter in the range of from 1 to 4 nm, is further preferred. Surprisingly, when using (preferred) compounds of the present invention in a method of the present invention method parameters can readily be identified resulting in such narrow platinum dot diameter distribution.

A product according to the invention is preferred, wherein the particles have at least 1 dot per 100 nm 2 , preferably at least 4 dots per 100 nm 2 , more preferably at least 6 dots per 100 nm 2 of the particle surface.

For identifying the number of dots per 100nm 2 a (two-dimensional) TEM photography of an individual particle is prepared and the particles in an area of 100 nm 2 are counted.

An abundance of materials may be used as a substrate of the product. In own investigations, it has been shown that products with some substrate materials have particularly good properties. Thus products of the invention are especially preferred wherein the substrate consists of or comprises (a) one or more oxides selected from the group con- sisting of Si0 2 , MgO, Al 2 0 3 , Ti0 2 , Zr0 2 , Y 2 0 3 , Cr 2 0 3 , La 2 0 3 , Fe 2 0 3 , ZnO, and SnO and/or (b) one or more mixed oxides of two, three or more oxides selected from the group consisting of Si0 2 , MgO, Al 2 0 3 , T1O2, Zr0 2 , Y 2 0 3 , Cr 2 0 3 , La 2 0 3 , Fe 2 0 3 , ZnO, and SnO.

Furthermore, a product according to the invention is preferred, wherein the substrate having one or more platinum dots on its surface is obtainable by a metal organic chemical vapor deposition process using the substrate not having dots as the substrate in the MOCVD process.

These products are characterized by the fact that the platinum dots have a narrow size distribution and have fewer impurities than products produced by wet chemical processes.

A product according to the invention is particularly preferred, wherein at least 90 % of the platinum dots have a mean Feret diameter in the range of from 70 % to 130 %, preferably 80 % to 120 %, more preferably 90 % to 1 10 %, of the average Feret diameter of the platinum dots.

Products of the present invention are preferably prepared by or preparable by a method of the present invention as discussed above. When corresponding products of the invention are carefully analyzed traces of compounds of formula (I) can be detected so that products prepared by a method of the present invention can be distinguished from other products.

A product according to the invention is particularly preferred, wherein the substrate having one or more platinum dots on its surface is obtainable by a metal organic chemical vapor deposition process, wherein a compound of the present invention is used as precursor to form the platinum dot(s) and/or the metal organic chemical vapor deposition process is performed according to the method as described above.

The invention also relates to the use of a product of the present invention (as defined above, preferably a product characterized as being preferred) as a catalyst (heterogeneous catalyst or photocatalyst), as part of an optical sensor, or as part of a gas sensor.

The present invention also relates to a catalyst system, preferably a catalyst system in a catalytic converter or for asymmetric hydrogenation, comprising or consisting of a product according to the invention. Within the present text, a catalyst system is considered to be a functional unit consisting of or comprising the catalyst. E.g., the supporting material or the casing of the catalyst in a catalytic converter are considered to be a part of a catalyst system.

The present invention also relates to a use of a product according to the invention as a catalyst, preferably in a catalytic converter or for the asymmetric hydrogenation.

Brief description of the drawings:

Fig. 1 : Schematic drawing of an assembly for the continuous generation of particles having platinum dots on their surface in the aerosol state by a combined CVS/MOCVD process under atmospheric pressure. The system consists of a CVS reactor (1 ) for the production of particles by CVS (chemical vapor synthesis), a sintering furnace (2) for the sintering of the produced particles, and a diffusion dryer (9) in which water can be removed from a particle aerosol produced in the CVS reactor (1 ) and sintered in the sintering furnace (2).

A nitrogen (N 2 ) stream that is saturated in a bubbling system (6) with a precursor for the CVS, air (10) and additional nitrogen (N 2 ) can be introduced into the CVS reactor (1 ), and the synthezised product can be transported into the sintering furnace (2), and subsequently into diffusion dryer (9).

The assembly depicted in Fig. 1 furthermore comprises a precursor sublimator (5), a heated transfer pipe (7), and a coating reactor (3). The metal organic precursor for MOCVD can be vaporized in the precursor sublimator (5) into a flow of nitrogen (N 2 ) provided by a nitrogen source. The vaporized metal organic precursor is subsequently transferred through a heated transfer pipe (7) to the coating reactor (3). In the reactor the particle aerosol that was dried in the diffusion dryer (9) and the vaporized metal organic precursor are mixed, the precursor releases platinum and platinum deposition on the substrate (i.e. the particles of the aerosol) takes place. The resulting particles (4) having platinum dots on their surface can be collected on a membrane, a TEM grid or can be analyzed via online measuring methods after leaving the coating reactor (3). The temperatures of the CVS reactor (1 ), sintering furnace (2), diffusion dryer (9), bubbling system (6), precursor sublimate (5) and the precursor sublimate (5) are controlled with Temperature Indicator Controllers (TIC). The flow of the Nitrogen (N 2 ) and the air (10) is controlled with Flow Indicator Controllers (FIC). Fig. 2: Schematic drawing of an assembly for the continuous generation of particles having platinum dots on their surface in the aerosol state in a MOCVD process under atmospheric pressure.

The assembly depicted in Fig. 2 comprises a precursor sublimator (5), a heated transfer pipe (7), and a coating reactor (3).

The metal organic precursor for MOCVD can be vaporized in the precursor sublimator (5) into a flow of nitrogen (N 2 ) provided by a nitrogen source. The vaporized metal organic precursor is subsequently transferred through a heated transfer pipe (7) to the coating reactor (3). In the reactor a particle aerosol (8) containing the particles that are deposited and the precursor vapor are mixed, the precursor releases platinum and platinum deposition on the substrate (i.e. the particles of the aerosol) takes place. The resulting particles (4) having platinum dots on their surface can be collected on a membrane, a TEM grid or can be analyzed via online measuring methods after leaving the coating reactor (3). The temperatures of the CVS reactor (1 ), sintering furnace (2), diffusion dryer (9), bubbling system (6), precursor sublimate (5) and the precursor sublimate (5) are controlled with Temperature Indicator Controllers (TIC). The flow of the Nitrogen (N 2 ) and the air (10) is controlled with Flow Indicator Controllers (FIC).

Fig. 3 is a TEM image of a Pt/Si0 2 particle produced by using a compound of formula (I) according to the invention as a precursor (Example 23). For the TEM image analysis Pt Si02 particles were generated and then collected on a TEM grid. Images were made using a Philips CM12. The image analyses were made using the imaging software "Image C" (Soft Imaging System).

Fig. 4 is a TEM photography of a Pt/Si0 2 particle produced by using (Trimethyl)methylcylopendadienylplatinum as a precursor (Comparative Example 1 ). For the TEM image analysis Pt/Si02 particles were generated and then collected on a TEM grid. Images were made using a Philips CM 12. The image analyses were made using the imaging software "Image C" (Soft Imaging System)

Fig. 5 shows the result of a thermogravimetric analysis (TGA) of compounds according to the invention in comparison with MeCpPtMe 3 (Example 22) Fig. 6: Schematic drawing of an assembly for the generation of particles having platinum dots on their surface in the aerosol state in a MOCVD process under atmospheric pressure.

The assembly depicted in Fig. 6 comprises a precursor sublimator (1 1 ), a fluidized bed reactor (14), a heated transfer pipe (7), and a filter (12).

The metal organic precursor for MOCVD can be vaporized in the precursor sublimator (1 1 ) into a flow of an inert gas (e.g. N 2 ) provided by a inert gas source. The vaporized metal organic precursor is subsequently transferred through a heated transfer pipe (7) to a fluidized bed reactor (14). The fluidized bed reactor (14) contains substrate particles and inert gas reactive gas mixture (e.g. N 2 /0 2 ) is passed through the particle bed to suspend the particles.

In the fluidized bed reactor (14) the substrate particles and the precursor vapor are mixed, the precursor releases platinum and platinum deposition on the substrate (i.e. the particles of the aerosol) takes place. To avoid any loss of particles the exhaust gases (13) pass a filter (12).

Fig. 7: Schematic drawing of an experimental setup for fixed bed MOCVD for the synthesis of supported Pt-nanoparticles. The system comprises a CVD reactor (71 ) for the production of Pt-nanoparticles and means for 0 2 delivery (72), means for precursor delivery (73), means for precursor exhaust (74), and means for oxidation exhaust (75). In addition, the system includes a first mass flow controller (76.1 ), a second mass flow controller (76.2), a precursor evaporator (77), a top three-way valve (78.1 ), and a bottom three-way valve (78.2).

All gas streams were controlled by mass flow controllers (76.1 and 76.2). The precursor evaporator (77) was isothermally heated by an oil-bath ensuring continuous and homo- geneous precursor delivery. A self-built stainless steel reactor (71 ) was constructed and fitted inside an experimental setup. The reactor consisted of two stainless steel frits (Macherey and Nagei) with a porosity of 0.5 micrometer at each end of a stainless steel tube, fixed inside a tube furnace. Two thermally isolated three-way valves (on the top (78.1 ) and on the bottom (78.2) of the reactor) were used in order to switch between precursor delivery under flowing nitrogen or oxidation, ensuring good gas supply and removal. This means that the reactor operates in either of two active modes: (i) the three- way valves 78.1 and 78.2 are opened such that precursors under nitrogen gas flow are delivered and precursor exhausts are released and (ii) the three-way valves 78.1 and 78.2 are opened such that oxygen for oxidation is delivered and oxidation exhausts are released.

Fig. 8: Median particle size distribution of Pt-nanoparticles on Al 2 0 3 synthesized by fixed bed MOCVD.

Fig. 9: TEM image of different Pt/metal oxide particles produced by fixed bed MOCVD. Fig. 9A shows Pt-nanoparticles deposited on Al 2 0 3 , Fig. 9B on Ti0 2 , and Fig. 9C on Si0 2 , respectively. For the TEM image analysis, respective Pt/metal oxide particles were generated and then collected on a TEM grid. Images were made using a Philips CM12. The image analyses were made using the imaging software "Image C" (Soft Imaging System).

The invention is now further described by selected examples and embodiments. These embodiments and examples are intended to represent certain preferred features of the present invention, without limiting the scope of this description or the scope of the claims. It is to be understood that the skilled artisan can devise further working examples and embodiments by his common general knowledge and the instructions and explanations given in this description and the documents incorporated herein by reference.

Examples:

Example 1 : General procedure for the synthesis of platinum complexes of the type rPtCI 2 (1-R-1.5-COmi: n-Propanol and the monosubstituted 1 ,5-Cycloocatdiene (6.90 eq.) are added to a solution of K 2 PtCI 4 (1.00 eq.) in water. Afterwards SnCI 2 (0.0300 eq.) is added and the mixture is stirred for two to five days at room temperature. The initial dark red to brownish solution becomes nearly colorless and the formation of a precipitate can be observed. The resulting precipitate is filtered, washed twice with water and once with ethanol or pentane and dried under reduced pressure.

Example 2: General procedure for the synthesis of platinum complexes of the type [Ptl 2 (1-R-1.5-COD)l:

Nal (2.15 eq.) is added at room temperature to a suspension of PtCI 2 (1-R-1 ,5-COD)] (1.00 eq.; synthesized as described in Example 1 ) in acetone. The color of the reaction mixture initially turns yellow and the mixture is stirred for three hours. Afterwards the acetone is removed under reduced pressure and the resulting residue is dissolved in a mixture of dichloromethane and water (1 :1 ). The phases are separated and the organic phase is washed twice with water, dried over sodium sulfate and filtered. After removal of the solvent under reduced pressure, the desired Ptl 2 (1-R-1 ,5-COD) complex can be obtained as a bright yellow to orange solid or wax.

Example 3: General procedure for the synthesis of platinum complexes of the type [PtMe 2 (1-R-1.5- COD)l:

A solution of MeLi in pentane (1 .6 M, 3.00 eq.) is added dropwise at 0°C to a suspension of [Ptl 2 (1-R-1 ,5-COD)] (1.00 eq.; synthesized as described in Example 2) and dry diethyl ether. The color of the reaction mixture turns brown during the reaction. After two hours an ice-cold ammonium chloride solution is added. The aqueous phase is extracted three times with diethyl ether and the organic phases are collected, dried over sodium sulfate, filtered and the solvent is removed under reduced pressure. The crude product may be slightly yellow and can be purified by column chromatography over silica gel (cyclohex- ane, 2% triethylamine).

Example 4: General procedure for the synthesis of platinum complexes of the type rPtPh 2 (1-R-1.5-COmi:

PtCI 2 (1-R-1 ,5-COD)] (1.00 eq.; synthesized as described in Example 1 ) is dissolved in dry diethyl ether. Phenylmagnesium bromide (2 M in tetrahydrofuran, 2.20 eq.) is added dropwise to the mixture. The resulting reaction mixture was stirred for 12 hours at room temperature and treated afterwards with an ammonium chloride solution. The aqueous phase is extracted three times with diethyl ether, the organic phases are collected, dried over sodium sulfate, filtered through Celite and activated carbon and the solvent is re- moved under reduced pressure. The resulting colorless solid is recrystallized from dichloromethane and pentane.

Example 5: General procedure for the synthesis of platinum complexes of the type [PtMe 2 (1-R-1.5-COD)l:

Pt(acac) 2 (1.00 eq.) and the monosubstituted 1 ,5-Cycloocatdiene (1.10 eq.) are dissolved in dry toluene. Trimethylaluminium (2.0 M in Toluol, 3.00 eq.) is added dropwise to the solution and the resulting reaction mixture was stirred 24 hours at room temperature. Afterwards the reaction mixture is quenched with an ammonium chloride solution and the organic phase is separated and washed several times with an aqueous 1 M hydrochloric acid solution and a sodium chloride solution. The separated organic phase is dried over sodium sulfate, filtered and the solvent is removed under reduced pressure. The crude product may be slightly yellow and can be purified by column chromatography over silica gel (cyclohexane, 2% triethylamine).

Example 6: Dichlorido-n 4 -((1 Z,5Z)-1-methylcycloocta-1 ,5-diene)-platinum [PtCI?(Me- comi:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 1 . 1 .01 g (6.90 eq., 8.26 mmol) (1Z,5Z)-1- methylcycloocta-1 ,5-diene was stirred with 497 mg (1 .00 eq., 1.20 mmol) K 2 PtCI 4 , 5.77 mL n-PrOH, 8.42 mL H 2 0 and 7.00 mg (0.0300 eq., 36.0 μηηοΙ) SnCI 2 for two days. 323 mg (0.832 mmol, 70%) of the desired product could be obtained as beige solid. - Decomposition temperature: 213 °C. - H-NMR (400 MHz, CDCI 3 ): δ (ppm) = 1.95 (s d, 2 J RH = 17.9 Hz, 3 H, CH 3 ), 2.03-2.09 (m, 1 H, CH 2 ), 2.15-2.50 (m, 4 H, CH 2 ), 2.55-2.68 (m, 1 H, CH 2 ), 2.70-2.90 (m, 2 H, CH 2 ), 5.35-5.55 (dd, 3 J HH = 6.9 Hz, 4 J HH = 2.8 Hz, 1 H, CH), 5.55-5.75 (m, 2 H, CH). - 3 C-NMR (100 MHz, CDCI 3 ): δ (ppm) = 29.0 (+, CH 3 ), 29.4 (-, CH 2 ), 30.7 (-, CH 2 ), 31 .7 (-, CH 2 ), 38.0 (-, CH 2 ), 96.1 (+, CH), 97.7 (+, CH), 99.9 (+, CH), 124.0 (C quart ). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -3298 (s). - IR (ATR) [cm -1 ]: v " = 3007 (vw), 2931 (vw), 2879 (vw), 2076 (vw), 1653 (vw), 151 1 (vw), 1478 (vw), 1458 (vw), 1430 (w), 1372 (vw), 1348 (vw), 1334 (vw), 1312 (w), 1240 (vw), 1212 (vw), 1 172 (vw), 1099 (vw), 1061 (vw), 1039 (vw), 1025 (vw), 1008 (w), 969 (vw), 903 (vw), 874 (vw), 854 (vw), 832 (vw), 798 (w). - UV Vis (CHCI 3 ): A max (log ε) = 229 (0.71 ), 250 (0.84), 299 (0.19), 386 (0.07) nm. - MS (70 eV, El), m/z (%): 390/389/388/387/386 (10/9/17/13/1 1 ) [M + ], 355/354/353/352/351/350 (9/39/36/100/86/74) [M + -CI], 318/317/316/315/314/313/312/31 1/310/309/308 ( 13/23/76/84/86/55/60/36/38/28/13) [M + - 2 CI], 286/285/284/283 (14/23/23/13), 273/272/271 (1 1/12/9), 261/260/259 (10/10/8), 235/234 (9/9), 122 (10) [C 9 H 14 + ], 107 (13) [C 8 Hn + ]. - HRMS (PtCI 2 C 9 H 14 ): calc. 387.0121 ; found 387.0124. - EA (PtCI 2 C 9 H 14 ): calc. C 27.85, H 3.64; found C 27.91 , H 3.60. Example 7: Diiodido-n 4 -((1 Z,5Z)-1-methylcvcloocta-1 ,5-dien)-platinum [Ptl?(Me-COD)l:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 2. 50.0 mg (1 .00 eq., 0.128 mmol) [PtCI 2 (Me-COD)] and 43.2 mg (2.15 eq., 0.258 mmol) Nal in 3 mL acetone were stirred together for three hours. 71.1 mg (0.126 mmol, 97%) of the desired product could be obtained as yellow solid. - Decomposition temperature: >170 °C. - H-NMR (400 MHz, CDCI 3 ): δ (ppm) = 1.70- 1.90 (m, 1 H, CH 2 ), 1.90-2.20 (m, 3 H, CH 2 ), 2.08 (s d, 2 J PtH = 20.7 Hz, 3 H, CH 3 ), 2.20- 2.40 (m, 2 H, CH 2 ), 2.50-2.61 (m, 1 H, CH 2 ), 2.61-2.80 (m, 1 H, CH 2 ), 5.56-6.02 (m, 3 H, CH). - 3 C-NMR (100 MHz, CDCI 3 ): δ (ppm) = 29.8 (-, CH 2 ), 31 .9 (-, CH 2 ), 32.3 (+, CH 3 ), 32.5 (-, CH 2 ), 36.2 (-, CH 2 ), 99.5 (+, CH), 99.7 (+, CH), 101.1 (+, CH), 128.9 (C quart ). - 9 5 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -4240 (s). - IR (ATR) [cm -1 ]: v " = 3000 (vw), 2940 (vw), 2874 (vw), 2825 (vw), 2108 (vw), 1718 (vw), 151 1 (vw), 1492 (vw), 1477 (vw), 1423 (w), 1368 (vw), 1347 (vw), 1335 (vw), 1312 (w), 1237 (vw), 1210 (vw), 1 191 (vw), 1 169 (vw), 1 142 (vw), 1095 (w), 1061 (vw), 1036 (vw), 1022 (vw), 1006 (w), 967 (vw), 939 (vw), 895 (vw), 874 (w), 853 (vw). - MS (70 eV, El), m/z (%): 574/572/571/570 (10/45/60/50) [M + ], 445/444/443/442/441 (25/30/36/1 1/15) [M + - l], 316/315/314/313/312/31 1/310 (1 1 Π 8/12/18/12/17/12) (13/23/76/84/86/55/60/36/38/28/13) [M + -2 I], 122 (52) [C 9 H 14 + ], 107 (39) [CeHu*], 94 (41 ), 68 (100). - HRMS (Ptl 2 C 9 H 14 ): calc. 570.8833; found 570.8831. - EA (Ptl 2 C 9 H 14 ): calc. C 18.93, H 2.47; found C 19.70, H 2.58.

Example 8: Dimethyl-n 4 -((1Z,5Z)-1-methylcvcloocta-1 ,5-dien latinum [PtMe z (Me-COD)l:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 5. 100 mg (1 .00 eq., 0.254 mmol) Pt(acac) 2 and 34.2 mg (1.10 eq., 0.254 mmol) (1 Z,5Z)-1-methylcycloocta-1 ,5-diene were dissolved in 10 mL toluene and 0.381 mL (2.0 M in toluene, 3.00 eq., 0.762 mmol) AIMe 3 was added dropwise. The crude product was purified by column chromatography over silica gel (cyclohexane, 2% triethylamine). 60.0 mg (0.172 mmol, 68%) of the desired product could be obtained as slightly yellow solid. - Melting point: 58 °C. - H-NMR (400 MHz, CDCI 3 ): δ (ppm) = 0.71 (s d, 2 J RH = 81.4 Hz, 6 H, CH 3 ), 1.79 (s d, 2 J PtH = 21 .2 Hz, 3 H, CH 3 ), 2.10-2.50 (m, 8 H, CH 2 ), 4.56-4.88 (m, 3 H, CH). - 3 C-NMR (100 MHz, CDCI 3 ): δ (ppm) = 2.9 (+, s d, J RC = 762 Hz,PtCH 3 ), 9.9 (+, s d, J RC = 796 Hz, PtCH 3 ), 26.7 (-, CH 2 ), 26.9 (-, CH 2 ), 29.2 (-, CH 2 ), 30.2 (-, CH 2 ), 37.0 (+, CH 3 ), 97.7 (+, s d, J RC = 54.0 Hz,CH), 98.4 (+, s d, J RC = 60.0 Hz, CH), 98.9 (+, s d, J RC = 44.6 Hz,CH), 1 15.4 (Cquart). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -3521 (s). - IR (ATR) [cm -1 ]: v " = 2992 (vw), 2917 (w), 2864 (m), 2793 (vw), 1524 (vw), 1478 (w), 1425 (w), 1371 (vw), 1345 (vw), 1314 (w), 1260 (vw), 1239 (vw), 1213 (vw), 1 193 (w), 1 170 (vw), 1 144 (vw), 1098 (vw), 1025 (m), 989 (w), 961 (w), 899 (vw), 855 (w), 806 (vw), 786 (m), 734 (vw), 601 (vw), 555 (vw), 540 (m), 459 (w). - MS (70 eV, El), m/z (%): 350/349/348/347/346 (4/1/16/20/18) [M + ], 335/334/333/332/331 (1/1/6/8/7) [M + -CH 3 ], 320/319/318/317/316/315/314/313/312/31 1 (5/17/23/83/100/82/20/23/13/13) [M + - 2 CH 3 ]. - HRMS: (PtCnH 20 ): calc. 347.1213; found. 347.1215.

Example 9: n 4 -((1 Z,5Z)-1-Methylcvcloocta-1 ,5-diene)diphenyl platinum [PtPh z (Me-COD)l:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 4. 50.0 mg (1.00 eq., 0.128 mmol) [PtCI 2 (Me-COD)] were reacted with 150 μΙ_ (2 M in tetrahydrofuran, 2.20 eq. , 0.281 mmol) PhMgCI. The resulting crude product is recrystallized from dichloromethane and pentane. 55.1 mg (0.1 15 mmol, 90%) of the desired product could be obtained as colorless solid. - Decomposition temperature: > 1 10 °C. - H-NMR (400 MHz, CDCI 3 ): δ = 1.45 (s d, 2 J PtH = 23.6 Hz, 3 H, CH 3 ), 2.22-2.69 (m, 8 H, CH 2 ), 4.72-5.18 (m, 3 H, CH), 6.77 (t, 3 J = 7.3 Hz, 2 H, C Ar H), 6.96 (t, 3 J = 7.3 Hz, 4 H, C Ar H), 7.00-7.20 (m, 1 H, C Ar H), 7.22 (t, 3 J = 7.3 Hz, 2 H, C Ar H). - 3 C-NMR (100 MHz, CDCI 3 ): 5 = 28.1 (+, CH 3 ), 29.3 (-, CH 2 ), 29.5 (-, CH 2 ), 29.9 (-, CH 2 ), 36.7 (-, CH 2 ), 103.7 (+, CH), 103.9 (+, CH), 104.6 (+, CH), 1 15.2 (C quart ), 121.3 (Cquart ), 127.2 (+, 2 x CA T ), 127.5 (+, 2 x C Ar ), 128.7 (+, 2 x C Ar ), 134.5 (+, 2 x C Ar ), 134.8 (+, 2 x CA T ). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ = -3564 (s). - IR (ATR) [cm- 1 ]: v J = 3335 (vw), 3049 (vw), 2988 (vw), 2937 (w), 1799 (vw), 1568 (m), 1465 (w), 1420 (m), 1371 (vw), 1338 (vw), 1315 (vw), 1258 (w), 1206 (vw), 1 171 (vw), 1098 (vw), 1077 (vw), 1059 (w), 1020 (m), 894 (vw), 863 (vw), 844 (vw), 790 (m), 728 (m), 693 (m), 655 (vw), 609 (vw), 551 (vw), 496 (vw), 474 (w). - MS (70 eV, El), m/z (%): 472/471/470 (8/8/6) [M + ], 318/317/316&315/314 (25/30/36/1 1/15) [M + - 2 x C 6 H 5 ], 107 (65) [C 8 Hn + ]. - HRMS (PtC 21 H 24 ): calc. 471.1525; found 471.1526. - EA (PtC 21 H 24 ): calc. C 53.49, H 5.13; found C 53.61 , H 5.17.

Example 10: Dichlorido-n 4 -((1 Z.5Z)-1-ethylcvcloocta-1.5-dien)platin [PtCl z (Et-COD)l:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 1. 453 mg (6.90 eq., 3.32 mmol) (1Z,5Z)-1- ethylcycloocta-1 ,5-diene was stirred with 200 mg (1.00 eq., 0.482 mmol) K 2 PtCI 4 , 2.15 mL nPrOH, 3.12 mL H 2 0 and 4.00 mg (0.0300 eq., 0.0210 mmol) SnCI 2 for two days. 172 mg (0.424 mmol, 88%) of the desired product could be obtained as beige solid. - Decomposition temperature: > 144 °C .- H NMR (400 MHz, CDCI 3 ): δ (ppm) = 1.30 (t, 3 J = 7.3 Hz, 3 H, CH 3 ), 1.82-2.12 (m, 3 H, CH 2 ), 2.30-2.64 (m, 5 H, CH 2 ), 2.76-2.90 (m, 2 H, CH 2 CH 3 ), 5.37-5.73 (m, 3 H, CH). - 3 C-NMR (100 MHz, CDCI 3 ): 12.4 (+, CH 3 ), 28.3 (-, CH 2 ), 32.7 (-, CH 2 ), 33.1 (-, CH 2 ), 33.9 (-, CH 2 ), 34.7 (-, CH 2 ), 96.7 (+, CH), 98.5 (+, CH) , 99.2 (+, CH), 128.4 (C quart ). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -3315 (s). - IR (ATR) [cm -1 ]: v " = 3409 (vw), 3009 (vw), 2962 (vw), 2930 (vw), 2877 (w), 2834 (vw), 1655 (vw), 1506 (vw), 1491 (vw), 1461 (vw), 1430 (m), 1371 (vw), 1344 (vw), 1316 (w), 1250 (w), 1235 (vw), 1212 (vw), 1187 (vw), 1 172 (vw), 1 146 (vw), 1 105 (vw), 1080 (vw), 1052 (w), 1032 (vw), 101 1 (m), 963 (w), 927 (vw), 901 (vw), 878 (w), 857 (vw), 836 (m), 804 (w), 742 (vw), 696 (w), 670 (vw), 620 (w), 528 (vw), 468 (w), 424 (vw). - MS (70 eV, El), m/z (%): 404/402/401 400 (1/1/1/1 ) [M + ], 367/366/365/364/363 (21/19/52/48/42) [M + -

CI] , 332/331/329/328/327/326/325 (17/12/74/100/97/26/26) [M + -2 CI], 107 (4) [C 8 Hn + ]. - HRMS (PtCI 2 Ci 0 H ie ): calc. 401.0277; found. 401 .0275. - EA (PtCI 2 C 10 H 16 ): calc. C 29.86, H 4.01 ; found C 31.14, H 4.07.

Example 1 1 :n 4 -((1 Z,5Z)-1-Ethylcycloocta-1 ,5-diene)diiodido platinum [Ptl z (Et-COD)l:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 2. 142 mg (1 .00 eq., 0.353 mmol) [PtCI 2 (Et-COD)] and 1 14 mg (2.15 eq., 0.760 mmol) Nal in 8.5 mL acetone were stirred together for three hours. 206 mg (0.351 mmol, 99%) of the desired product could be obtained as yellow solid. - Decomposition temperature: > 104 °C .- H-NMR (400 MHz, CDCI 3 ): δ (ppm) = 1.24 (t, 3 J HH = 7.3 Hz, 3 H, CH 3 ), 1.70-2.58 (m, 8 H, CH 2 ), 2.62-2.82 (m, 2 H, CH 2 CH 3 ), 5.52-5.82 (m, 2 H, CH), 5.92 (d d, 3 J HH = 6.3 Hz, 2 J RH = 53.0 Hz, 1 H, CH). - 3C-NMR (100 MHz, CDCI 3 ): δ (ppm) = 12.0 (+, CH 3 ), 28.5 (-, CH 2 ), 31 .9 (-, CH 2 ), 32.9 (-, CH 2 ), 35.2(- CH 2 ), 37.1 (-, CH 2 ), 99.3 (+, CH), 99.7 (+, CH), 100.9 (+, CH), 133.7 (C q u a rt). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -4268 (s). - IR (ATR) [cm -1 ]: v " = 2924 (w), 2876 (vw), 2828 (vw), 1655 (vw), 1479 (w), 1448 (w), 1424 (m), 1374 (w), 1353 (vw), 1336 (w), 1304 (w), 1245 (w), 1 184 (vw), 1 169 (vw), 1 143 (vw), 1094 (w), 1067 (w), 1039 (vw), 1002 (w), 977 (vw), 951 (w), 921 (vw), 893 (vw), 876 (w), 851 (vw), 828 (m), 798 (vw), 745 (w), 694 (vw), 554 (vw), 530 (w), 462 (vw), 433 (vw). - UV/Vis (CHCI 3 ): A max (log ε) = 227 (0.57), 229 (0.57), 250 (0.66), 299 (0.15), 382 (0.04) nm. - MS (70 eV, El), m/z (%): 587/586/585/584/583 (19/7/81/100/91 ) [M + ], 461/459/458/457/456/455/453 (8/43/36/72/18/46/1 1 ) [M + -l],

331/330/329/328/327/326/325 (28/34/53/35/45/22/27) [M + -2 I], 136 (18) [C 10 H 16 + ], 121 (8) [C 9 H 13 + ], 107 (33) [CeHu ]. - HRMS (Ptl 2 C 10 H 16 ): calc. 584.8989; found 584.8992.- EA (Ptl 2 Ci 0 H ie ): calc. C 20.53, H 2.76; found C 22.10 H 2.84. Example 12: n 4 -((1 Z,5Z)-1-Ethylcvcloocta-1 ,5-diene)dimethyl platinum [PtMe z (Et-COD)l:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 3. 125 mg (1 .00 eq., 0.214 mmol) [Ptl 2 (Et-COD)] and 430 μΙ_ MeLi (1.6 M in pentane, 3.00 eq., 0.641 mmol) were stirred together for two hours at 0 °C and then worked up. 63.3 mg (0.175 mmol, 82%) of the desired product could be obtained as yellow oil. - H-NMR (400 MHz, CDCI 3 ): δ (ppm) = 0.69 (s d, 2 J PtH = 81 .4 Hz, 6 H, CH 3 ), 1.06 (t, 3 J HH = 7.4 Hz, 3 H, CH 3 ), 1.88-2.56 (m, 10 H, CH 2 ), 5.28-5.37 (m, 1 H, CH), 5.45-6.64 (m, 2 H, CH). - 3 C-NMR (100 MHz, CDCI 3 ): δ (ppm) = 3.7 (+, PtCH 3 ), 9.3 (+, PtCH 3 ), 13.8 (+, CH 3 ), 27.3 (-, CH 2 ), 28.1 (-, CH 2 ), 31 .3 (-, CH 2 ), 32.6 (-, CH 2 ), 33.2 (-, CH 2 ), 97.7 (+, s d, J RC = 61.2 Hz, CH), 97.7 (+, s d, J RC = 55.2 Hz, CH), 98.9 (+, s d, Jptc = 46.0 Hz, CH), 141.3 (C quart ). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -3534 (s). - IR (KBr) [cm -1 ]: v " = 3442 (vw), 2927 (m), 2877 (vw), 1736 (vw), 1482 (vw), 1429 (w), 1374 (vw), 1339 (vw), 1315 (vw), 1216 (vw), 1099 (vw), 1056 (vw), 1001 (vw), 935 (vw), 870 (vw), 787 (vw), 540 (vw). - MS (70 eV, El), m/z (%): 364/362/361/360 (4/18/22/19) [M + ], 347/346/345 (7/8/7) [M + -CH 3 ], 333/332/331/330/329/328/327/326 (14/13/75/69/100/67/77/21 ) [M + -2 CH 3 ], 107 (5) [CeHu ]. - HRMS (PtC 12 H 22 ): calc. 361.1370; found 361.1371.

Example 13: n 4 -((1 Z,5Z)-1-ethylcvcloocta-1 ,5-dien)diphenyl platinum [PtPh z (Et-COD)l:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 4. 20.0 mg (1 .00 eq., 49.7 μητιοΙ) [PtCI 2 (Et-COD)] was reacted with 50.0 μΙ_ (2 M in THF, 2.20 eq., 0.1 10 mmol) PhMgCI. 18.2 mg (37.3 μηηοΙ, 75%) of the desired product could be obtained as colorless solid.- H-NMR (400 MHz, CDCI 3 ): δ = 0.94 (t, 3 J = 7.0 Hz, 3 H, CH 3 ), 1 .88 (q, 3 J = 7.0 Hz, 2 H, CH 2 ), 2.15-2.80 (m, 8 H, CH 2 ), 4.85-5.10 (m, 3 H, CH), 6.80-6.88 (m, 3 H, C Ar H), 6.88-7.00 (m, 3 H, C Ar H), 7.00-7.20 (m, 1 H, C Ar H), 7.20-7.30 (m, 4 H, C Ar H). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ = -3557 (s). - IR (KBr) [cm- 1 ]: v "1 = 3345 (br), 3057 (w), 2927 (m), 1944 (w), 1876 (w), 171 1 (vw), 1595 (m), 1569 (m), 1500 (w), 1480 (m), 1429 (m), 1375 (w), 1344 (w), 1263 (w), 1 170 (w), 1073 (m), 1023 (w), 903 (m), 812 (w), 730 (m), 697 (m), 610 (w), 509 (vw), 461 (w). - MS (70 eV, El), m/z (%): 486/485/484 (13/16/12) [M + ], 332/330/329/328/326 (9/35/42/41/8) [M + - 2 Ph], 136 (12) [C 10 H 16 + ], 121 (12) [C 9 H 13 + ], 107 (100) [CeHu ], 91 (49) [C 7 H 7 + ], 67 (35) [C 5 H 7 + ]. - HRMS (PtC 22 H 26 ): calc. 485.1682 found 485.1685. Example 14: Dichlorido-n 4 -((1 E,5Z)-1-phenylcvcloocta-1 ,5-diene)platinum [PtCI?(Ph-

COD)l:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 1. 305 mg (6.90 eq., 1.66 mmol) (1 E,5Z)-1- phenylcycloocta-1 ,5-diene was reacted with 100 mg (1 .00 eq., 0.241 mmol) K 2 PtCI 4 , 1.08 mL nPrOH, 1.56 mL H 2 0 and 2.00 mg (0.0300 eq., 1 .00 μηηοΙ) SnCI 2 for two days. 63.1 mg (1.26 mmol, 76 %) of the desired product could be obtained as yellow solid.

- Decomposition temperature: > 200 °C. - H-NMR (400 MHz, CDCI 3 ): δ = 2.00-2.15 (m, 1 H, CH 2 ), 2.35-2.52 (m, 2 H, CH 2 ), 2.53-2.73 (m, 2 H, CH 2 ), 2.78-2.93 (m, 1 H, CH 2 ), 2.96-3.09 (m, 1 H, CH 2 ), 3.1 1 -3.24 (m, 1 H, CH 2 ), 5.59-5.89 (m, 2 H, CH), 6.04-6.28 (m,

1 H, CH), 7.32-7.36 (m, 2 H, C Ar H), 7.37-7.43 (m, 1 H, C Ar H), 7.51 -7.56 (d, 3 J = 7.3 Hz,

2 H, C Ar H). - 3 C-NMR (100 MHz, CDCI 3 ): δ = 29.3 (-, CH 2 ), 32.7 (-, CH 2 ), 33.4 (-, CH 2 ), 38.1 (-, CH 2 ), 91.8 (+, CH), 98.3 (+, CH), 100.4 (+, CH), 120 (C quart ), 127.7 (+, C Ar H), 128.4 (+, C Ar H), 130.1 (+, C Ar H). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ = -3191 (s). - IR (ATR) [cm- 1 ]: v "1 = 3015 (w), 2882 (w), 2829 (vw), 1595 (w), 1571 (vw), 1523 (w), 1483 (m), 1449 (w), 1420 (w), 1339 (w), 1302 (vw), 1273 (vw), 1 191 (w), 1095 (vw), 1074 (w), 1024 (w), 989 (w), 978 (vw), 921 (w), 874 (vw), 849 (w), 807 (w), 756 (m), 737 (w), 696 (m), 635 (vw), 598 (w), 529 (w), 499 (m). - MS (70 eV, El), m/z (%): 451/450/449/448/447 (8/8/15/1 1/9) [M + ], 416/414/413/412 (6/16/16/13) [M + - CI], 379/378/377 (6/7/12) [M + - 2 CI], 184 (98) [C 14 H 16 + ], 129 (100) [C 10 H 9 + ], 107 (13) [C 8 Hn + ]. - HRMS (C 16 H 22 CI 2 Pt): calc. 449.0277; found 449.0275.

Example 15: Diiodido-n 4 -((1 E,5Z)-1-phenylcvcloocta-1 ,5-dien latinum [Ptl z (Ph-COD)l:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 2. 50.0 mg (1.00 eq., 0.1 1 1 mmol) [PtCI 2 (Ph-COD)] and 35.8 mg (2.15 eq., 0.238 mmol) Nal in 3 mL acetone were stirred together for three hours. 73.9 mg (0.1 10 mmol, 99%) of the desired product could be obtained as orange solid.

- Decomposition temperature: > 151 °C. - H-NMR (400 MHz, CDCI 3 ): δ = 1.78-1.98 (m, 1 H, CH 2 ), 2.00-2.55 (m, 4 H, CH 2 ), 2.55-2.73 (m, 1 H, CH 2 ), 2.78-2.93 (m, 1 H, CH 2 ), 3.04-3.18 (m, 1 H, CH 2 ), 5.75-6.05 (m, 2 H, CH), 6.39 (td, 3 J = 7.0 Hz, 2 J PtH = 34.4 Hz, 1 H, CH), 7.31 -7.40 (m, 3 H, C Ar H), 7.48-7.55 (m, 2 H, C Ar H). - 3 C-NMR (100 MHz, CDCI 3 ): δ = 29.7 (-, CH 2 ), 33.1 (-, CH 2 ), 35.2 (-, CH 2 ), 36.5(- CH 2 ), 94.8 (+, CH), 100.5 (+, CH), 102.0 (+, CH), 125.5 (C quart ), 126.2 (+, C Ar H), 127.5 (+, C Ar H), 128.1 (+, C Ar H), 129.8 (+, C Ar H), 142.3 (+, C Ar H). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ = -4150 (s). - IR (ATR) [cm- 1 ]: v "1 = 3052 (vw), 3013 (vw), 2915 (vw), 2873 (w), 1653 (vw), 1595 (w), 1473 (w), 1439 (w), 1426 (vw), 1410 (vw), 1339 (w), 1305 (w), 1253 (vw), 1208 (vw), 1 180 (vw), 1 166 (vw), 1099 (vw), 1073 (vw), 1026 (vw), 1008 (vw), 987 (vw), 950 (w), 906 (vw), 881 (w), 856 (w), 832 (vw), 798 (w), 758 (w), 741 (m), 693 (m), 647 (vw), 586 (w), 551 (w), 514 (vw), 486 (vw), 454 (w). - UV Vis (CHCI 3 ): A max (log ε) = 231 (0.78), 296 (0.37), 382 (0.07), 394 (0.07) nm. - MS (70 eV, El), m/z (%): 635/633/632/631 (5/26/33/26) [M + ], 508/506/505/504 (8/33/39/36) [M + - I], 379/378/377/375 (6/1 1/17/1 1 ) [M + - 2 I], 185/184 (18/100) [C 16 H 16 + ], 129 (87) [C 10 H 9 + ], 1 15 (65) [C 9 H 7 + ]. - HRMS (C 16 H 22 l 2 Pt): calc. 632.8989; found 632.8992. - EA (C 16 H 22 l 2 Pt): calc. C 26.56, H 2.55; found C 27.67, H 2.66.

Example 16: Dimethyl-n 4 -((1 E,5Z)-1-phenylcvcloocta-1 ,5-diene)platinum [PtMe?(Ph- comi:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 3. 30.0 mg (1 .00 eq., 47.3 μιηοΙ) [PtMe 2 (Ph-COD)] and 95.0 μΙ_ (1 .6 M in pentane, 3.00 eq., 0.142 mmol) MeLi were stirred together for two hours at 0°C and then worked up. 15.5 mg (37.4 μητιοΙ, 79%) of the desired product could be obtained as a slightly yellow solid. - Decomposition temperature: > 100 °C. - 95 Pt-NMR (129 MHz, CDCI 3 ): δ = -3401 (s). - IR (ATR) [cm- 1 ]: v " = 2917 (vw), 2871 (w), 1595 (w), 1475 (w), 1439 (w), 1340 (w), 1307 (w), 1257 (w), 1 179 (vw), 1095 (vw), 1075 (w), 1001 (m), 947 (w), 881 (w), 856 (w), 832 (vw), 798 (m), 756 (m), 742 (w), 691 (m), 648 (vw), 621 (w), 606 (w), 588 (w), 553 (m), 514 (w), 485 (w), 457 (w), 406 (w). - MS (70 eV, El), m/z (%): 412/41 1/410/409/408 (1 /1 /1 /1 /1 ) [M + ], 397/395/394/393 (1/1/1/1 ) [M + - CH 3 ], 379/378/377 (1/1/1 ) [M + - 2 CH 3 ], 184 (100) [C 16 H 16 + ], 143 (92) [Cn Hn*], 130 (84) [C 10 H 10 + ], 1 15 (22) [C 9 H 7 + ], 107 (1 ) [C 8 Hn + ]. - HRMS (C 18 H 28 Pt): calc. 409.1369; found 409.1367.

Example 17: Diphenyl-n 4 -((1 E,5Z)-1-phenylcvcloocta-1 ,5-diene)platinum [PtPh?(Ph- comi:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 4. 10.0 mg (1 .00 eq., 22.2 μηηοΙ) [PtCI 2 (Ph-COD)] was reacted with 22.0 μΙ_ (2 M in tetrahydrofuran, 2.20 eq., 48.8 μηηοΙ) PhMgCI. 6.00 mg (1 1 .1 μιηοΙ, 50%) of the desired product could be obtained as slightly yellow solid. - 95 Pt- NMR (129 MHz, CDCI 3 ): δ = -3548 (s). - IR (KBr) [cm- 1 ]: v " = 3355 (br), 3033 (w), 2930 (vw), 1944 (w), 1876 (w), 1748 (vw), 1595 (m), 1569 (w), 1499 (w), 1479 (m), 1453 (vw), 1429 (w), 1374 (vw), 1344 (w), 1235 (m), 1 169 (w), 1074 (m), 1024 (vw), 1008 (w), 903 (m), 812 (w), 754 (vw), 737 (m), 697 (m), 610 (w), 544 (vw), 508 (w), 460 (vw). - MS (70 eV, El), m/z (%): 536/535/534/533/532/530 (1/1/1/1/1/1 ) [M + ], 458/457/456 (1/1/1 ) [M + - C 6 H 5 ], 379/378/377 (1/1/1 ) [M + - 2 C 6 H 5 ], 184 (6) [C 14 H 16 + ], 166 (24) [C 13 H 10 + ], 107 (100) [C 8 Hn + ]. - HRMS (C 28 H 32 Pt): calc. 533.1683 found 533.1680.

Example 18: Dichlorido-n 4 -((1 E,5Z)-1-isopropylcvcloocta-1 ,5-diene) platinum [PtCI?(iPr- comi:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 1. 250 mg (6.90 eq., 1.66 mmol) (1 E,5Z)-1- isopropylcycloocta-1 ,5-diene was reacted with 105 mg (1.00 eq., 0.241 mmol) K 2 PtCI 4 , 1.10 mL n-PrOH, 1.60 mL H 2 0 und 2.00 mg (0.0300 eq., 10.0 μηηοΙ) SnCI 2 for two days. 95.5 mg (0.219 mmol, 91 %) of the desired product could be obtained as a slightly yellow solid. - Decomposition temperature: >150 °C. - H-NMR (400 MHz, CDCI 3 ): δ (ppm) = 0.95 (d, 3 J HH = 6.9 Hz, 6 H, CH 3 ), 2.20 (sept, 3 J HH = 6.9 Hz, 1 H, CH(CH 3 ) 2 ), 2.25-2.42 (m, 8 H, CH 2 ), 5.46-5.56 (m, 2 H, CH), 5.56-5.66 (m, 1 H, CH). - 3 C-NMR (100 MHz, CDCI 3 ): δ (ppm) = 21.0 (+, 2 CH 3 ), 26.3 (-, CH 2 ), 27.2 (-, CH 2 ), 27.7 (-, CH 2 ), 29.9 (-, CH 2 ), 36.4 (+, CH), 1 19.5 (+, CH), 127.6 (+, CH), 127.7 (+, CH), 144.2 (C quart ). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -3307 (s). - IR (ATR) [cm -1 ]: v " = 3009 (vw), 2963 (w), 2928 (vw), 2885 (vw), 1654 (vw), 1481 (vw), 1459 (vw), 1424 (w), 1381 (vw), 1360 (vw), 1336 (vw), 1308 (w), 1251 (vw), 1 194 (vw), 1 176 (vw), 1089 (vw), 1062 (w), 1036 (vw), 1025 (vw), 1010 (m), 968 (vw), 887 (vw), 859 (w), 829 (w), 800 (vw), 778 (vw), 734 (vw), 697 (vw), 664 (vw), 612 (w), 580 (vw), 542 (vw), 500 (vw), 468 (w). - MS (70 eV, El), m/z (%): 419/418/417/416/415/414/412 (1/1/1/1/1/1/1 ) [M + ], 382/381/380/379/378 (7/6/16/16/15) [M + -CI], 344/343/342/341/340 (29/36/38/14/14) [M + - 2 CI], 300/299/298/297 (13/1 1/25/12), 150 (24) [CnH 18 + ], 135 (25) [C 10 H 15 + ], 107 (77) [CeHu * ], 91 (52), 81 (100), 79 (97), 67 (59), 43 (45). - HRMS (PtCI 2 CiiH 18 ): calc. 415.0434; found 415.0437.

Example 19: Diiodido-n 4 -((1 E,5Z)-1-isopropylcvcloocta-1 ,5-diene) platinum [Ptl?(iPr- comi:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 2. 10.0 mg (1 .00 eq., 0.0240 mmol) [PCI 2 (iPr-COD)] and 7.70 mg (2.15 eq., 51.6 μιηοΙ) Nal in 0.50 mL acetone were stirred together for three hours. 14.0 mg (0.0230 mmol, 97%) of the desired product could be obtained as yellow solid. - H-NMR (300 MHz, CDCI 3 ): δ (ppm) = 0.95 (dd, 2 J HH = 64.0 Hz, 3 J HH = 6.7 Hz, 6 H, CH 3 ), 2.32-2.80 (m, 8 H, CH 2 ), 3.38 (sept, 3 J = 6.7 Hz, 1 H, CH(CH 3 ) 2 ), 5.52-5.92 (m, 3 H, CH). - 3 C-NMR (100 MHz, CDCI 3 ): δ (ppm) = 21.2 (+, 2 CH 3 ), 26.4 (-, CH 2 ), 27.9 (-, CH 2 ), 28.8 (-, CH 2 ), 30.2 (-, CH 2 ), 38.3 (+, CH), 121.1 (+, CH), 130.2 (+, CH), 130.6 (+, CH), 148.0 (C quart ). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -4255 (s). - IR (ATR) [cm 1 ]: v " = 3006 (vw), 2923 (w), 2880 (vw), 1655 (vw), 1499 (vw), 1475 (w), 1424 (w), 1374 (vw), 1337 (w), 1308 (vw), 1222 (vw), 1 172 (w), 1086 (w), 1067 (vw), 1036 (vw), 1004 (w), 961 (vw), 907 (vw), 887 (vw), 865 (w), 824 (w), 799 (w), 776 (vw), 732 (w), 694 (w), 608 (w), 569 (vw), 502 (vw), 459 (m). MS (70 eV, El), m/z (%): 598/597 (14/13) [M + ], 557/556/555 (18/16/24), 507/506/505 (24/23/22), 471/470/469 (13/17/13) [Ml], 380/379 (27/24), 345/344/343/342/341/340 (41/72/100/69/50/25) [M + D2 x I], 150 (13) [CnH 18 + ], 135 (14) [C 10 H 15 + ], 107 (36) [C 8 H^ + ], 91 (39), 79 (53), 67 (35), 43 (21 ). - HRMS (Ptl 2 CnH 18 ): calc. 598.9146; found 598.9142. Example 20: n 4 -((1 E,5Z)-1-lsopropylcvcloocta-1 ,5-dien)dimethylplatin [PtMe z (iPr-COD)1:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 5. 374 mg (1 .00 eq., 950 μιηοΙ) Pt(acac) 2 and 157 mg (1.10 eq., 1.04 mmol) (1 E,5Z)-1-isopropylcycloocta-1 ,5-diene were dissolved in toluene (37 mL) and 1.43 mL (2.0 m in toluene, 3.00 eq., 2.85 mmol) AIMe 3 was added dropwise. The reaction mixture was worked up after 24 hours. 168 mg (448 μιηοΙ, 47%) of the desired product could be obtained as a slightly yellow solid. - Melting point: 54 °C - H- NMR (400 MHz, CDCI 3 ): δ (ppm) = 0.62 (d d, 2 J PtH = 81.2 Hz, 3 J HH = 2.4 Hz, 6 H, CH(CH 3 ) 2 ), 0.90 (d, 3 J HH = 6.9 Hz, 3 H, CH 3 ), 1 .05 (d, 3 J HH = 6.9 Hz, 3 H, CH 3 ), 1.80-1.92 (m, 1 H, CH(CH 3 ) 2 ), 1.94-2.16 (m, 3 H, CH 2 ), 2.20-2.50 (m, 4 H, CH 2 ), 2.54-2.66 (m, 1 H, CH 2 ), 4.42-4.58 (m, 1 H, CH), 4.61 -4.82 (m, 2 H, CH). - 3 C-NMR (100 MHz, CDCI 3 ): δ (ppm) = 3.9 (+, 2 x PtCH 3 ), 9.2 (+, 2 x CH(CH 3 ) 2 ), 26.5 (-, CH 2 ), 27.1 (-, CH 2 ), 32.2 (-, CH 2 ), 33.3 (-, CH 2 ), 36.8 (+,CH(CH 3 ) 2 ), 97.0 (+, s d, J RC = 62.6 Hz,CH), 97.9 (+, s d, J RC = 57.2 Hz,CH), 99.1 (+, s d, J Ptc = 47.6 Hz,CH), 124.2 (Cq ua r t ). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -3526 (s). - IR (ATR) [cm- 1 ]: v " = 3442 (vw), 2957 (m),2927 (vw), 2874 (w), 2834 (vw), 2797 (vw), 1524 (vw), 1483 (vw), 1462 (vw), 1431 (w), 1381 (vw), 1358 (vw), 1340 (vw), 1310 (vw), 1284 (vw), 1216 (vw), 1 196 (vw), 1 165 (vw), 1088 (vw), 1065 (w), 1037 (vw), 999 (vw), 956 (vw), 925 (vw), 875 (vw), 859 (vw), 814 (vw), 783 (vw), 729 (vw), 603 (vw), 557 (vw), 538 (vw), 450 (vw). - MS (70 eV, El), m/z (%): 376/375/374 (9/1 1/1 1 ) [M + ], 361/360/359 (9/12/9) [M + -CH 3 ], 345/344/343/342/341/340/339 (55/66/100/75/70/21/22) [M + -2xCH 3 ], 299 (1 1 ), 297 (12), 91 (14), 77 (10). - HRMS (PtC 13 H 24 ): calc. 375.1526; found 375.1524.

Example 21 : n 4 -((1 Z,5Z)-1-isopropylcvcloocta-1 ,5-diene)diphenylplatinum [PtPh?(iPr- comi: The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 5. 30.0 mg (1.00 eq., 89.0 μιηοΙ) [PtCI 2 (iPr-COD)] was reacted with 88.0 μΙ_ (2 M in tetrahydrofuran, 2.20 eq., 0.196 mmol) PhMgCI. 12.7 mg (29.4 μητιοΙ, 35%) of the desired product could be obtained as a slightly yellow solid. - IR (KBr) [cm- 1 ]: v " = 3233 (br), 3031 (vw), 2925 (w), 1657 (vw), 1593 (w), 1569 (vw), 1535 (vw), 1475 (w), 1429 (vw), 1377 (vw), 1 169 (w), 1041 (m), 903 (vw), 754 (vw), 735 (m), 695 (m), 608 (vw), 544 (vw), 510 (w). - MS (70 eV, El), m/z (%): 500/499/498 (24/28/23) [M + ], 347/346/345/344/343/342/341 (20/24/22/64/74//77/28) [M + - 2 Ph], 297 (18), 281 (17), 230 (23), 183 (41 ), 150 (20) [CnH 18 ], 135 (23) [C 10 H 15 + ], 131 (74), 121 (30) [C 9 H 13 + ], 107 (73) [CeHu*], 95 (35) [C / Hn*], 91 (98), 81 (83) [C 6 H 9 + ], 79 (100), 67 (53) [C 5 H 7 + ], 43 (64) [C 3 H 7 + ]. - HRMS (C 23 H 28 Pt): calc. 499.1839; found 499.1839.

Example 22: Dichlorido-n 4 -((1 E,5Z)-1-n-butylcvcloocta-1 ,5-diene) platinum [PtCI?(nBu- comi:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 1. 503 mg (6.90 eq., 3.06 mmol) (1 E,5Z)-1-n- butylcycloocta-1 ,5-diene was reacted with 184 mg (1 .00 eq., 0.444 mmol) K 2 PtCI 4 , 2.03 mL n-PrOH, 2.95 mL H 2 0 und 2.50 mg (0.0300 eq., 13.3 μηηοΙ) SnCI 2 for five days. 180 mg (0.418 mmol, 94%) of the desired product could be obtained as a slightly yellow solid. - Decomposition temperature: >143 °C. - H-NMR (400 MHz, CDCI 3 ): δ (ppm) = 0.86 (t, 3 J = 7.2 Hz, 3 H, CH 3 ), 1 .19-1 .33 (m, 2 H, CH 2 ), 1.40-1.48 (m, 1 H, CH 2 ), 1 J4-2.04 (m, 4 H, CH 2 ), 2.16-2.57 (m, 5 H, CH 2 ), 2.70-2.81 (m, 2 H, CH 2 ), 5.42- 5.34 (m, 3 H, CH). - 3 C-NMR (100 MHz, CDCI 3 ): δ (ppm) = 13.8 (+, CH 3 ), 22.7 (-, CH 2 ), 28.4 (-, CH 2 ), 30.2 (-, CH 2 ), 32.4 (-, CH 2 ), 32.8 (-, CH 2 ), 34.3 (-, CH 2 ), 41.3 (-, CH 2 ), 96.7 (+, CH), 98.2 (+,CH), 99.3 (+,CH), 128.1 (C quart ). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -3307 (s). - IR (KBr) [cm -1 ]: v " = 2956 (s), 2929 (w), 2867 (s), 1502 (vs), 1484 (m), 1464 (s), 1431 (w), 1412 (s), 1379 (s), 1335 (s), 1317 (m), 1246 (s), 1 191 (s), 1 171 (vs), 1098 (m), 1083 (s), 1041 (s), 1009 (w), 975 (s), 948 (s) 919 (m), 901 (s), 876 (m), 854 (s), 836 (m), 803 (m), 763 (s), 727 (s), 699 (s), 567 (vw), 549 (vs), 477 (m), 437 (s), 421 (s), 404 (s). - MS (70 eV, El), m/z (%): 396/395/394/393/392 (14/12/37/37/27) [M + - Cl], 358/357/356/355/354 (61/69/100/71/72)[M + - 2 CI], 164 (23) [C 12 H 20 + ], 107 [C 8 Hn + ], 79 (22), 68 (16), 41 (10). - HRMS (M + - CI, C 12 H 20 CIPt): calc. 394.0902; found 394.0901. Example 23: Diiodido-n 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-diene) platinum [Ptl z (nBu-COD)l:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 2. 140 mg (1 .00 eq., 0.325 mmol) [PCI 2 (nBu-COD)] and 105 mg (2.15 eq., 0.700 mmol) Nal in 8 mL acetone were stirred together for three hours. 169 mg (0.276 mmol, 85%) of the desired product could be obtained as an orange wax. - H-NMR (400 MHz, CDCI 3 ): δ (ppm) = 0.85 (t, 3 J = 7.2 Hz, 3 H, CH 3 ), 1.19-1.31 (m, 2 H, CH 2 ), 1.34-1.43 (m, 1 H, CH 2 ), 1.67-2.07 (m, 6 H, CH 2 ), 2.10-2.20 (m, 1 H, CH 2 ), 2.34- 2.40 (m, 1 H, CH 2 ), 2.47-2.76 (m, 3 H, CH 2 ), 5.45-5.94 (m, 3 H, CH). - 3 C-NMR (100 MHz, CDCI 3 ): 5 (ppm) = 13.8 (+, CH 3 ), 22.4 (-, CH 2 ), 28.6 (-, CH 2 ), 29.8 (-, CH 2 ), 32.4 (-, CH 2 ), 32.8 (-, CH 2 ), 35.0 (-, CH 2 ), 43.8 (-, CH 2 ), 99.3 (+, CH), 99.4 (+,CH), 100.7 (+,CH), 133.4 (C quart ). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -4262 (s). - IR (KBr) [cm -1 ]: v " = 3480 (s), 2950 (vw), 2923 (s), 2856 (s), 1699 (vs), 1503 (s), 1477 (s), 1463 (s), 1424 (vw), 1374 (s), 1341 (s), 131 1 (m), 1237 (s), 1 188 (s), 1 169 (s), 1096 (m), 1039 (s), 1004 (m), 968 (s), 934 (m), 918 (s), 893 (s), 873 (m), 851 (s), 828 (m), 799 (s), 756 (s), 723 (m), 694 (vs), 619 (s), 561 (m), 465 (m). - MS (70 eV, El), m/z (%): 616/614/613/612 (12/53/64/54) [M + ], 487/486/485 (20/24/25) [M + -l], 359/358/357/356/355 (70/82/100/43/55) [C 12 H 20 Pt + ], 164 (26) [C 12 H 20 + ]. - HRMS (C 12 H 20 Ptl 2 ): calc. 612.9303; found 612.9304.

Example 24: n 4 -((1 E,5Z)-1-n-Butylcvcloocta-1 ,5-diene)dimethylplatinum [PtMe z (nBu- comi: The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 5. 218 mg (1 .00 eq., 0.553 mmol) Pt(acac) 2 and 100 mg (1.10 eq., 0.609 mmol) (1 E,5Z)-1-n-butylcycloocta-1 ,5-diene were dissolved in toluene (21 mL) and 0.834 mL (2 M in toluene, 3.00 eq., 1 .66 mmol) AIMe 3 was added dropwise. The reaction mixture was worked up after 24 hours. 174 mg (0.446 mmol, 81 %) of the desired product could be obtained as colorless oil. - H-NMR (400 MHz, CDCI 3 ): δ (ppm) = 0.69 (s d, 2 J RH = 81.5 Hz, 6 H, CH 3 ), 0.89 (d, 3 J = 7.2 Hz, 3 H, CH 3 ), 1.19-1.38 (m, 3 H, CH 2 ), 1.56-1.62 (m, 1 H, CH 2 ), 1 .84-1 .99 (m, 1 H, CH 2 ), 2.03-2.18 (m, 3 H, CH 2 ), 2.20-2.26 (m, 2 H, CH 2 ), 2.29-2.52 (m, 4 H, CH 2 ), 4.64-4.80 (m, 3 H, CH). - 3 C- NMR (100 MHz, CDCI 3 ): δ (ppm) = 3.5 (+, PtCH 3 ), 9.5 (+, PtCH 3 ), 14.0 (+, CH 3 CH 2 ), 22.7 (-, CH 2 ), 28.3 (-, CH 2 ), 30.9 (-, CH 2 ), 31.0 (-, CH 2 ), 31 .5 (-, CH 2 ), 33.1 (-, CH 2 ), 40.2 (-, CH 2 ), 97.5 (+, s d, J RC = 58.3 Hz, CH), 97.8 (+, s d, J RC = 61 .5 Hz, CH), 99.3 (+, s d, Jptc = 46.1 Hz, CH), 120.0 (C quart ). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -3530 (s). - IR (ATR) [cm -1 ]: v " = 3442 (vs), 2925 (vw), 2873 (s), 2834 (vs), 2797 (vs), 1656 (vs), 1525 (vs), 1480 (vs), 1464 (vs), 1431 (s), 1378 (vs), 1340 (vs), 1315 (vs), 1216 (vs), 1 195 (vs), 1 167 (vs), 1 104 (vs), 1 103 (vs), 999 (vs), 929 (vs), 88 (vs), 790 (vs), 730 (vs), 559 (vs), 539 (s). - MS (70 eV, El), m/z (%): 390/389/380 (3/2/2) [M + ], 375/374/373 (14/16/14) [M + -CH 3 ], 359/358/357/356/355/354/353 (32/70/66/85/100/48) [M + -2xCH 3 ]. - HRMS (PtC 14 H 26 ): calc. 389.1682; found 389.1681.

Example 25: Dichlorido-n 4 -((1 E,5Z)-1-isobutylcvcloocta-1 ,5-diene) platinum [PtCI 2 (iBu- comi:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 1. 494 mg (6.90 eq., 3.01 mmol) (1 E,5Z)-1- isobutylcycloocta-1 ,5-diene was reacted with 181 mg (1.00 eq., 0.436 mmol) K 2 PtCI 4 , 2.00 mL n-PrOH, 2.90 mL H 2 0 und 2.48 mg (0.0300 eq., 13.1 μηηοΙ) SnCI 2 for five days. 172 mg (0.400 mmol, 91 %) of the desired product could be obtained as beige solid. - Decomposition temperature: >161 °C. - H-NMR (400 MHz, CDCI 3 ): δ (ppm) = 0.73 (d, 3 J HH = 6.6 Hz, 3 H, CH 3 ), 1.03 (d, 3 J HH = 6.6 Hz, 3 H, CH 3 ), 1 .80-1 .87 (m, 1 H, CH), 2.00- 2.08 (m, 2 H, CH 2 ), 2.26-2.51 (m, 5 H, CH 2 ), 2.56-2.63 (m, 1 H, CH 2 ), 2.72-2.82 (m, 2 H, CH 2 ), 5.49-5.63 (m, 3 H, CH). - 3 C-NMR (100 MHz, CDCI 3 ): δ (ppm) = 21 .2 (+,CH 3 ), 23.9 (+, CH 3 ), 27.9 (+, CH), 29.2 (-, CH 2 ), 31.4 (-, CH 2 ), 31.6 (-, CH 2 ), 34.5 (-, CH 2 ), 50.1 (-, CH 2 ), 96.9 (+, CH), 97.1 (+,CH), 99.9 (+,CH), 128.0 (C quart ). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -3287 (s). - IR (KBr) [cm -1 ]: v " = 2955 (vw), 2927 (s), 2867 (s), 2349 (s), 1703 (s), 1502 (s), 1480 (s), 1462 (m), 1426 (s), 1384 (s), 1366 (s), 1343 (w), 1282 (s), 1242 (s), 1 163 (s), 1 108 (m), 1010 (m), 947 (s), 901 (s), 862 (w), 806 (s), 754 (s), 671 (s), 665 (s), 629 (m), 596 (s), 528 (s), 470 (m), 406 (s). - MS (70 eV, El), m/z (%): 431/430/429/428 (1/1/1/1 ) [M + ], 396/395/394/393/392 (17/17/42/40/34) [M + -CI], 358/357/356/355/354 (53/61/100/72/79) [M + -2 * CI], 79 (12), 68 (4), 41 (19). - HRMS (C 12 H 20 CI 2 Pt): calc. 429.0590; found 429.0587. Example 26: Diiodido-n 4 -((1 E,5Z)-1-isobutylcvcloocta-1 ,5-diene) platinum [Ptl?(iBu- comi:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 2. 85.4 mg (1.00 eq., 0.198 mmol) [PCI 2 (iBu-COD)] and 64.0 mg (2.15 eq., 0.427 mmol) Nal in 3.5 mL acetone were stirred together for three hours. 1 16 mg (0.189 mmol, 96%) of the desired product could be obtained as an orange wax. - H-NMR (400 MHz, CDCI 3 ): δ (ppm) = 0.78 (d, 3 J HH = 6.6 Hz, 3 H, CH 3 ), 1 -01 (d, 3 JHH = 6.6 Hz, 3 H, CH 3 ), 1.74-1.89 (m, 3 H, CH 2 ), 1.96-2.05 (m, 1 H, CH), 2.17-2.23 (m, 1 H, CH 2 ), 2.24-2.53 (m, 3 H, CH 2 ), 2.58-2.76(m, 3 H, CH 2 ), 5.57-5.92 (m, 3 H, CH). - 3C-NMR (100 MHz, CDCI 3 ): δ (ppm) = 21.3 (+, CH 3 ), 23.9 (+, CH 3 ), 28.5 (-, CH 2 ), 29.6 (-, CH 2 ), 31.8 (-, CH 2 ), 32.5 (-, CH 2 ), 33.3 (-, CH 2 ), 53.1 (+, CH), 98.3 (+, CH), 100.0 (+,CH), 101.0 (+,CH), 133.6 (C quart ). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -4225 (s). - IR (KBr) [cm -1 ]: v " = 3855 (s), 3650 (s), 2954 (vw), 2349 (s), 1654 (s), 1506 (s), 1458 (s), 1428 (vw), 1383 (s), 131 1 (m), 1 164 (s), 1 105 (m), 1008 (s), 947 (s), 895 (s), 867 (s), 801 (m), 740 (s), 671 (s), 665 (s), 622 (m), 460 (m). - MS (70 eV, El), m/z (%): 616/614/613/612 (14/60/74/65) [M + ], 487/486/485/484/483 (31/35/45/25/21 ) [M + -l], 359/358/357/356/355 (35/42/70/49/64) [C 12 H 20 Pt + ], 164 (39) [C 12 H 20 + ], 121 (72), 107 (99), 93 (67), 79 (100), 67 (82), 41 (56). - HRMS (C 12 H 20 Ptl 2 ): calc. 612.9303; found 612.9299.

Example 27: n 4 -((1 E,5Z)-1-lsobutylcvcloocta-1 ,5-diene)dimethylplatinum [PtMe 2 (iBu- comi:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 5. 501 mg (1.00 eq., 1 .27 mmol) Pt(acac) 2 and 230 mg (1.10 eq., 1.40 mmol) (1 E,5Z)-1-isobutylcycloocta-1 ,5-diene were dissolved in toluene (45 mL) and 1.91 mL (2 M in toluene, 3.00 eq., 3.81 mmol) AIMe 3 was added dropwise. The reaction mixture was worked up after 24 hours. 386 mg (0.991 mmol, 78%) of the desired product could be obtained as a colorless solid. - Melting point: 65 °C. - H-NMR (400 MHz, CDCI 3 ): δ (ppm) = 0.69 (s d, 2 J PtH = 81.3 Hz, 3 H, PtCH 3 ), 0.71 (s d, 2 J RH = 81.6 Hz, 3 H, PtCH 3 ), 0.74 (d, 3 J HH = 6.1 Hz, 3 H, CH 3 ), 0.93 (d, 3 J HH = 6.2 Hz, 3 H, CH 3 ), 1.62-1.73 (m, 2 H, CH 2 ), 2.14-2.46 (m, 9 H, 4 CH 2 , CH), 4.62-4.75 (m, 3 H, CH). - 3 C-NMR (100 MHz, CDCI 3 ): δ (ppm) = 3.1 (+, s d, J RC = 694 Hz, PtCH 3 ), 10.2 (+, s d, Jptc = 726 Hz, PtCH 3 ), 21.0 (+,CH 3 CH), 23.8 (+,CH 3 CH), 27.8 (-, CH 2 ), 29.1 (-, CH 2 ), 29.6 (-, CH 2 ), 30.2 (-, CH 2 ), 33.5 (-, CH 2 ), 49.7 (+, CH), 96.9 (+, s d, J RC = 55.6 Hz,CH), 98.4 (+, s d, J R c = 61.8 Hz,CH), 100.2 (+, s d, J RC = 45.6 Hz,CH), 1 19.2 (+, s d, Jp tc = 50.8 Hz, Cquart). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -3519 (s). - IR (ATR) [cm -1 ]: v " = 3451 (s), 2925 (vw), 2873 (s), 2834 (vs), 2798 (vs), 1658 (vs), 1641 (vs), 1563 (vs), 1567 (vs), 1526 (vs), 1480 (vs), 1463 (m), 1429 (s), 1383 (s), 1365 (s), 1343 (s), 1216 (vs), 1 195 (vs), 1167 (s), 1 1 10 (s), 998 (vs), 923 (s), 883 (vs), 863 (vs), 782 (vs), 735 (vs), 559 (vs), 540 (s). - MS (70 eV, El), m/z (%): 390/389/377 (4/5/4) [M + ], 375/374/373 (14/22/19) [M + -CH 3 ], 359/358/357/356/355/354 (53/33/100/68/65/47) [M + -2xCH 3 ]. - HRMS (PtC 14 H 26 ): calc. 389.1682; found 389.1681.

Example 28: Dichlorido-n 4 -((1 E,5Z)-1-n-hexylcvcloocta-1 ,5-diene) platinum [PtCI?(nHex- comi:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 1. 538 mg (6.90 eq., 2.80 mmol) (1 E,5Z)-1-n- hexylcycloocta-1 ,5-diene was reacted with 168 mg (1 .00 eq., 0.405 mmol) K 2 PtCI 4 , 1.85 mL n-PrOH, 2.69 mL H 2 0 und 2.30 mg (0.0300 eq., 0.0122 mmol) SnCI 2 for five days. 1 14 mg (0.249 mmol, 62%) of the desired product could be obtained as a slightly yellow solid. - Decomposition temperature: >124 °C. .- H-NMR (400 MHz, CDCI 3 ): δ (ppm) = 0.82 (t, 3 J = 6.7 Hz, 3 H, CH 3 ), 1 .21-1 .25 (m, 6 H, CH 2 ), 1.39-1.45 (m, 1 H, CH 2 ), 1 J7-2.03 (m, 4 H, CH 2 ), 2.26-2.55 (m, 5 H, CH 2 ), 2.69-2.81 (m, 2 H, CH 2 ), 5.35- 5.57 (m, 3 H, CH). - 3 C-NMR (100 MHz, CDCI 3 ): δ (ppm) = 14.0 (+, CH 3 ), 22.5 (-, CH 2 ),

28.2 (-, CH 2 ), 28.4 (-, CH 2 ), 29.2 (-, CH 2 ), 31.4 (-, CH 2 ), 32.5 (-, CH 2 ), 32.7 (-, CH 2 ),

34.3 (-, CH 2 ), 41.6 (-, CH 2 ), 96.6 (+, CH), 98.1 (+,CH), 99.2 (+,CH), 127.9 (C quart ). - 95 Pt- NMR (129 MHz, CDCI 3 ): δ (ppm) = -3306 (s). - IR (KBr) [cm -1 ]: v " = 3014 (vs), 2954 (s),

2924 (vw), 2855 (s), 1504 (s), 1458 (s), 1429 (w), 1377 (vs), 1343 (s), 1316 (m), 1248 (s), 1 195 (vs), 1 174 (s), 1 101 (s), 1045 (vs), 1012 (m), 961 (vs), 908 (s), 867 (m), 833 (s), 804 (s), 724 (s), 628 (m), 531 (s), 571 (m). - MS (70 eV, El), m/z (%): 424/423/422/421/420 (3/3/9/7/7) [M + -CI], 386/385/384/383/382(28/36/40/18/20) [M + -2 CI], 192 (79) [C 14 H 24 + ], 121 (92), 107 (98) [C 8 Hn + ], 79 (100). - HRMS (M + -CI, C 14 H 24 CIPt): calc. 422.1215; found 422.1213.

Example 29: Diiodido-n 4 -((1 E,5Z)-1-n-hexylcvcloocta-1 ,5-diene) platinum [Ptl?(nHex- comi:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 2. 53.6 mg (1.00 eq., 0.1 17 mmol) [PCI 2 (nHex-COD)] and 37.7 mg (2.15 eq., 0.251 mmol) Nal in 3 mL acetone were stirred together for three hours. 59.7 mg (0.0931 mmol, 80%) of the desired product could be obtained as an orange wax. - H-NMR (400 MHz, CDCI 3 ): δ (ppm) = 0.81 (t, 3 J HH = 6.8 Hz, 3 H, CH 3 ), 1.19-1.29 (m, 6 H, CH 2 ), 1.35-1.44 (m, 1 H, CH 2 ), 1 .67-2.08 (m, 6 H, CH 2 ), 2.10-2.20 (m, 1 H, CH 2 ), 2.33-2.39 (m, 1 H, CH 2 ), 2.48-2.73 (m, 3 H, CH 2 ), 5.46-5.95 (m, 3 H, CH). - 3 C- NMR (100 MHz, CDCI 3 ): δ (ppm) = 14.0 (+, CH 3 ), 22.6 (-, CH 2 ), 27.8 (-, CH 2 ), 28.7 (-, CH 2 ), 29.0 (-, CH 2 ), 31.4 (-, CH 2 ), 32.4 (-, CH 2 ), 32.8 (-, CH 2 ), 34.9 (-, CH 2 ), 44.1 (-, CH 2 ), 99.3 (+, CH), 99.4 (+,CH), 100.7 (+,CH), 133.4 (C quart ). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -4261 (s). - IR (KBr) [cm -1 ]: v " = 3491 (vs), 2952 (s), 2921 (vw), 2852 (s), 171 1 (s), 1506 (s), 1454 (s), 1422 (w), 1376 (vs), 1343 (s), 1313 (s), 1237 (s), 1 190 (vs), 1 168 (s), 1089 (s), 1005 (s), 943 (vs), 864 (s), 827 (s), 801 (m), 723 (m), 622 (m), 585 (vs), 523 (s), 457 (m). - MS (70 eV, El), m/z (%): 642/641/640(39/53/46) [M + ], 515/514/513(1 1/15/14) [M + -l], 387/386/385/384/383 (73/85/100/44/49) [C 14 H 24 Pt + ], 192 (29) [C 14 H 24 + ]. - HRMS (C 14 H 24 Ptl 2 ): calc. 640.9616; found 640.9614.

Example 30: n 4 -((1 E,5Z)-1-n-Hexylcvcloocta-1 ,5-diene)dimethylplatinum [PtMe?(nHex- comi:

The compound was prepared according to the general procedure for the synthesis of platinum complexes of example 5. 186 mg (1 .00 eq., 0.473 mmol) Pt(acac) 2 and 100 mg (1.10 eq., 0.520 mmol) (1 E,5Z)-1-n-butylcycloocta-1 ,5-diene were dissolved in toluene (18 mL) and 0.712 mL (2 M in toluene, 3.00 eq., 1 .42 mmol) AIMe 3 was added dropwise. The reaction mixture was worked up after 24 hours. 172 mg (0.412 mmol, 87%) of the desired product could be obtained as a colorless oil. - H-NMR (400 MHz, CDCI 3 ): δ (ppm) = 0.69 (s d, 2 J RH = 81.6 Hz, 6 H, CH 3 ), 0.88 (t, 3 J = 6.6 Hz, 3 H, CH 3 ), 1 21-1.33 (m, 8 H, CH 2 ), 1.56-1.63 (m, 1 H, CH 2 ), 1 .85-1 .96 (m, 1 H, CH 2 ), 2.04-2.17 (m, 3 H, CH 2 ), 2.21-2.29 (m, 2 H, CH 2 ), 2.36-2.53 (m, 3 H, CH 2 ), 4.65-4.75 (m, 3 H, CH). - 3 C- NMR (100 MHz, CDCI 3 ): δ (ppm) = 3.5 (+, s d, J RC = 765 Hz, PtCH 3 ), 9.5 (+,s d, J RC = 778 Hz, PtCH 3 ), 14.1 (+, CH 3 CH 2 ), 22.6 (-, CH 2 ), 28.3 (-, CH 2 ), 29.2 (-, CH 2 ), 29.3 (-, CH 2 ), 30.9 (-, CH 2 ), 31.0 (-, CH 2 ), 31.7 (-, CH 2 ), 33.1 (-, CH 2 ), 40.5 (-, CH 2 ), 97.5 (+, s d, J RC = 55.6 Hz,CH), 97.8 (+, s d, J RC = 59.7 Hz,CH), 99.3 (+, s d, J RC = 46.2 Hz,CH), 1 19.8 (s d, J RC = 55.7 Hz,C quart ). - 95 Pt-NMR (129 MHz, CDCI 3 ): δ (ppm) = -3527 (s). - IR (ATR) [cm -1 ]: v " = 3443 (vs), 2924 (vw), 2873 (s), 2798 (vs), 1658 (vs), 1525 (vs), 1480 (vs), 1464 (s), 1432 (vs), 1378 (vs), 1340 (vs), 1315 (vs), 1217 (s), 1 197 (vs), 1 168 (vs), 1 107 (s), 1000 (vs), 866 (s), 788 (vs), 725 (vs), 560 (vs), 540 (s). - MS (70 eV, El), m/z (%):417 (1 ) [M + ], 403/402/401 (22/26/21 ) [M + -CH 3 ], 389/388/387/386/385/384/383/382/381 (8/9/47/62/100/77/70/21/23) [M + -2 CH 3 ], 79 (6), 43 (9). - HRMS (PtC 16 H 30 ): calc. 417.1996; found 417.1997. Example 31 : Thermogravimetric analysis of compounds according to the invention in comparison with MeCpPtMe 3 :

Thermogravimetric analysis was performed on a Netzsch TG-209 TGA system and the weight loss rat of the sample was measured. 5 mg of the measured complex was weighed under argon atmosphere into an Al 2 0 3 boat and transferred to the TGA system. Thermogravimetric analysis was performed in a nitrogen stream (50 mL/min) and the sample was heated with a heating rate of 10 K min to a temperature of 100°C (120° for Me 2 Pt(iBu-COD) and 50°C MeCpPtMe 3 ) and maintained at this temperature. Then the weight loss rate was measured. Me 2 Pt(n-Et-COD), Me 2 Pt(n-Bu-COD), Me 2 Pt(i-Bu-COD) and MeCpPtMe 3 were measured. The compounds according to the invention show a continuous and linear weight loss, and they sublimate in a range between 100 and 120°C. MeCpPtMe 3 shows a non-linear weight loss, in particular at the beginning of the sublimation.

The results are shown in Fig. 5. Example 32: Preparation of Pt/SiO^-Particles by combination of CVS and MOCVD

The experimental set-up is shown in Fig. 1. a) Chemical vapor synthesis (CVS) of sub-micrometer-sized Si0 2 support particles

In a first step, aerosols of nanometer-sized silica support particles (Si0 2 -Particles) were synthesized by decomposition of tetraethyl orthosilicate (TEOS) vapor (c(TEOS) = 4.1 *10 "5 mol L " in a stream of nitrogen gas (300 mL min " , nominally 99.99%). The nitrogen is first saturated with TEOS vapor in a temperature-controlled bubbling system (6) at 60°C. The gas/vapor mixture is diluted with air (10) (4 L min -1 ), and then fed to a CVS Reactor (1 ) (Carbolite CTF 12/600; ID 12 mm, heated length 600mm) at 1000°C, where the TEOS decomposes and nucleates to oxide particles. This aerosol is sintered in a sintering tube furnace (2) (Carbolite STF 15/ 450; ID 25 mm, heated length 450mm) at 1500°C to obtain spherical aerosol particles with average Feret diameter of about 70 nm. These sintered spheres provide well-defined surfaces for subseguent TEM image analysis of the coating results. The carrier particle number concentration was 10 7 cm 3 at a total flow rate of 300ml_ min "1 . The aerosol is finally dried in a diffusion dryer (9) to remove water vapor and then fed to the MOCVD process. b) Pt dots deposition onto the sub-micrometer-sized Si0 2 support particles by metal organic chemical vapor deposition (MOCVD) n 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)dimethyl platinum [(1-ethyl-COD)PtMe 2 ], a solid precursor, was stored at -23°C under argon in a closed flask. For the deposition of Pt dots onto the Si0 2 support particles the precursor was inserted in a glove-box containing a microbalance. Under argon atmosphere 10-12 mg of the precursor was weighed into an Al 2 0 3 boat and transferred afterwards in a closed vessel to a precursor sublimator (5). The (1-ethyl-COD)PtMe 2 on the boat is vaporized into a flow of nitrogen (150 ml/min) in the precursor sublimator (5) at 100°C. The precursor vapor is transferred through a heated transfer pipe (7) and then mixed with carrier particle aerosol and fed to the coating reactor (3) at a temperature of 100°C. The coating reactor was made of glass with an inner diameter of 45 mm and a length of 300 mm. Precursor losses were minimized by heating the coating reactor walls to 380 °C. The Pt/Si0 2 particles in the resulting Pt Si0 2 aerosol (4) are collected on a membrane, a TEM grid or can be analyzed via online measuring methods after they pass the coating reactor (3).

The resulting product (Si0 2 particles having platinum dots on their surface) is analyzed by TEM. A TEM photography of one particle having platinum dots on its surface is shown in Fig. 3.

Experiments using dichlorido-n 4 -((1Z,5Z)-1-methylcycloocta-1 ,5-dien) platinum, diiodido- n 4 -((1Z,5Z)-1-methylcycloocta-1 ,5-dien) platinum, dimethyl-n 4 -((1Z,5Z)-1-methylcycloocta- 1 ,5-dien) platinum, n 4 -((1Z,5Z)-1-methylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido- H 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien) platinum, r) 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5- dien)diiodido platinum, n 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)dimethyl platinum, η 4 - ((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido-r| 4 -((1 E,5Z)-1- phenylcycloocta-1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, dimethyl-n 4 -((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, diphenyl-η 4 - ((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, dichlorido-r| 4 -((1 E,5Z)-1- isopropylcycloocta-1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-lsopropylcycloocta-1 ,5-dien) platinum, n 4 -((1 E,5Z)-1-isopropylcycloocta-1 ,5-dien)dimethyl platinum, η 4 -((1Ζ,5Ζ)-1- isopropylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido-n 4 -((1 E,5Z)-1-n-butylcycloocta- 1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum, dimethyl- n. 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum, diphenyl-n. 4 -((1 E,5Z)-1-n- butylcycloocta-1 ,5-dien) platinum, dichlorido-n 4 -((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, dimethyl-η 4 - ((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, diphenyl-n. 4 -((1 E,5Z)-1-iso- butylcycloocta-1 ,5-dien) platinum, dichlorido-n 4 -((1 E,5Z)-1-n-hexylcycloocta-1 ,5-diene) platinum, diiodido-n 4 -((1 E,5Z)-1-n-hexylcycloocta-1 ,5-diene) platinum, and η 4 -((1 Ε,5Ζ)-1- n-hexylcycloocta-1 ,5-diene)dimethylplatinum as precursor show similar results. Example 33: Preparation of Pt/SiO Particles by MOCVD

The experimental set-up is shown in Fig. 2.

Pt dots deposition onto sub-micrometer-sized Si0 2 support particles by metal organic chemical vapor deposition (MOCVD)

(1-ethyl-COD)PtMe 2 , a solid precursor, was stored at -23°C under argon in a closed flask. For the deposition of Pt dots onto the Si0 2 support particles the precursor was inserted into a glove-box containing a microbalance. Under argon atmosphere 10-12 mg of the precursor was weighed into an Al 2 0 3 boat and transferred afterwards in a closed vessel to a precursor sublimator (5). The (1 -ethyl-COD)PtMe 2 in the boat is vaporized into a flow of nitrogen (150 ml/min) in the precursor sublimator (5) at 100°C. The precursor vapor is transferred through a heated transfer pipe (7) and then mixed with a carrier particle (300 mL min ~1 ; N 2 and Si0 2 particles with a average Feret diameter of 70 nm) aerosol (8) and fed to the coating reactor (3) at a temperature of 100°C. The coating reactor was made of glass with an inner diameter of 45 mm and a length of 300 mm. Precursor losses were minimized by heating the coating reactor walls to 380 °C. The Pt/Si0 2 particles in the resulting Pt Si0 2 aerosol (4) are collected on a membrane, a TEM grid or can by analyzed via online measuring methods after they pass the coating reactor (3).

The resulting product (Si0 2 particles having platinum dots on their surface) is analyzed be TEM. The TEM photography of one particle having platinum dots on its surface is similar to the TEM photography as shown in Fig. 3. Experiments using dichlorido-n 4 -((1 Z,5Z)-1-methylcycloocta-1 ,5-dien) platinum, diiodido- H 4 -((1Z,5Z)-1-methylcycloocta-1 ,5-dien) platinum, dimethyl-n 4 -((1Z,5Z)-1-methylcycloocta- 1 ,5-dien) platinum, n 4 -((1Z,5Z)-1-methylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido- H 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien) platinum, r) 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5- dien)diiodido platinum, n 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)dimethyl platinum, η 4 - ((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido-r| 4 -((1 E,5Z)-1- phenylcycloocta-1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, dimethyl-n 4 -((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, diphenyl-η 4 - ((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, dichlorido-n. 4 -((1 E,5Z)-1- isopropylcycloocta-1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-lsopropylcycloocta-1 ,5-dien) platinum, n 4 -((1 E,5Z)-1-isopropylcycloocta-1 ,5-dien)dimethyl platinum, η 4 -((1Ζ,5Ζ)-1- isopropylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido-n 4 -((1 E,5Z)-1-n-butylcycloocta- 1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum, dimethyl- H 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum, diphenyl-n. 4 -((1 E,5Z)-1-n- butylcycloocta-1 ,5-dien) platinum, dichlorido-n 4 -((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, dimethyl-η 4 - ((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, diphenyl-n. 4 -((1 E,5Z)-1-iso- butylcycloocta-1 ,5-dien) platinum, dichlorido-n 4 -((1 E,5Z)-1-n-hexylcycloocta-1 ,5-diene) platinum, diiodido-n 4 -((1 E,5Z)-1-n-hexylcycloocta-1 ,5-diene) platinum, and η 4 -((1 Ε,5Ζ)-1- n-hexylcycloocta-1 ,5-diene)dimethylplatinum as precursor show similar results.

Example 34: Preparation of Pt/TiCvParticles by combination of CVS and MOCVD: The experimental set-up is shown in Fig. 1. a) Chemical vapor synthesis (CVS) of sub-micrometer-sized Ti0 2 support particles

In a first step, aerosols of nanometer-sized Ti0 2 support particles (Ti0 2 -Particles) were synthesized by decomposition of titanium(IV)isopropoxide (TTIP) vapor (c(TTIP) = 4.1 x10 "5 mol L " in a stream of nitrogen gas (300 mL min "1 , nominally 99.99%). The nitrogen is first saturated with TTIP vapor in a temperature-controlled bubbling system (6) at 60°C. The gas/vapor mixture is diluted with air (10) (4 L min -1 ), and then fed to a CVS Reactor (1 ) (Carbolite CTF 12/600; ID 12 mm, heated length 600mm) at 1000°C, where the TTIP decomposes and nucleates to oxide particles. This aerosol is sintered in a sintering tube furnace (2) (Carbolite STF 15/ 450; ID 25 mm, heated length 450mm) at 1500°C to obtain spherical aerosol particles with average Feret diameter of about 80 nm. These sintered spheres provide well-defined surfaces for subsequent TEM image analysis of the coating results. The carrier particle number concentration was 10 7 cm- 3 at a total flow rate of 300ml_ min "1 . The aerosol is finally dried in a diffusion dryer (9) to remove water vapor and then fed to the MOCVD process. b) Pt dots deposition onto the sub-micrometer-sized Ti0 2 support particles by metal organic chemical vapor deposition (MOCVD) n 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)dimethyl platinum [(1-ethyl-COD)PtMe 2 ], a solid precursor, was stored at -23°C under argon in a closed flask. For the deposition of Pt dots onto the ΤΊ02 support particles the precursor was inserted in a glove-box containing a microbalance. Under argon atmosphere 10-12 mg of the precursor was weighed into an Al 2 0 3 boat and transferred afterwards in a closed vessel to a precursor sublimator (5). The (1-ethyl-COD)PtMe 2 onto the boat is vaporized into a flow of nitrogen (150 ml/min) in the precursor sublimator (5) at 100°C. The precursor vapor is transferred through a heated transfer pipe (7) and then mixed with carrier particle aerosol and fed to the coating reactor (3) at a temperature of 100°C. The coating reactor was made of glass with an inner diameter of 45 mm and a length of 300 mm. Precursor losses were minimized by heating the coating reactor walls to 380 °C. The Pt Ti0 2 particles in the resulting Pt Ti02 aerosol (4) are collected on a membrane, a TEM grid or can be analyzed via online measuring methods after they pass the coating reactor (3).

Experiments using dichlorido-n 4 -((1Z,5Z)-1-methylcycloocta-1 ,5-dien) platinum, diiodido- H 4 -((1Z,5Z)-1-methylcycloocta-1 ,5-dien) platinum, dimethyl-n 4 -((1Z,5Z)-1-methylcycloocta- 1 ,5-dien) platinum, n 4 -((1Z,5Z)-1-methylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido- H 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien) platinum, r) 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5- dien)diiodido platinum, n 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)dimethyl platinum, η 4 - ((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido-r| 4 -((1 E,5Z)-1- phenylcycloocta-1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, dimethyl-n 4 -((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, diphenyl-η 4 - ((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, dichlorido-r| 4 -((1 E,5Z)-1- isopropylcycloocta-1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-lsopropylcycloocta-1 ,5-dien) platinum, n 4 -((1 E,5Z)-1-isopropylcycloocta-1 ,5-dien)dimethyl platinum, η 4 -((1Ζ,5Ζ)-1- isopropylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido-n 4 -((1 E,5Z)-1-n-butylcycloocta- 1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum, dimethyl- n. 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum, diphenyl-n. 4 -((1 E,5Z)-1-n- butylcycloocta-1 ,5-dien) platinum, dichlorido-n 4 -((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, dimethyl-η 4 - ((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, diphenyl-n. 4 -((1 E,5Z)-1-iso- butylcycloocta-1 ,5-dien) platinum, dichlorido-n 4 -((1 E,5Z)-1-n-hexylcycloocta-1 ,5-diene) platinum, diiodido-n. 4 -((1 E,5Z)-1-n-hexylcycloocta-1 ,5-diene) platinum, and η 4 -((1 Ε,5Ζ)-1- n-hexylcycloocta-1 ,5-diene)dimethylplatinum as precursor show similar results. Example 35: Pt/SiQ 2 -Particles

An aerosol of nanometer-sized silica support particles (Si0 2 -Particles; substrate) were synthesized according to the process described in Example 32. Precursor vapor for MOCVD is prepared according to the process described in Example 32. The experimental set-up is shown in Fig. 6.

Alternative a)

The synthesized nanometer-sized silica support particles (Si0 2 -Particles) are fluidized in a fluidized bed reactor (14) and the vaporized metal organic precursor is subsequently transferred through a heated transfer pipe (7) to the fluidized bed reactor (14). For this (1-ethyl-COD)PtMe 2 , a solid precursor, was stored at -23°C under argon in a closed flask. For the deposition of Pt dots onto the Si0 2 support particles the precursor was inserted into a glove-box containing a microbalance. Under argon atmosphere 10-12 mg of the precursor was weighed into an Al 2 0 3 boat and transferred afterwards in a closed vessel to a precursor sublimator (5). The (1-ethyl-COD)PtMe 2 in the boat is vapor- ized into a flow of nitrogen (150 ml/min) in the precursor sublimator (5) at 100°C.

The fluidized bed reactor (14) had an inner diameter of 70 mm and a height of 800 cm and was electrically heated. The reaction temperature can be varied in the range of 50 to 500°C. The main fluidization flow entered the reactor through a glass frit at the bottom end and was varied between 2 and 20 l/min. Fluidization requires the break-up of large agglomerates, which can be achieved by vibration, a small (0.2-1 l/min) but high velocity (10-100 m/s) gas flow produced by a small orifice (200-600 μιτι) mounted to a lance (15) which is inserted into the particle bed, or other measures. Intensive intermixing of the fluidized particles ensures a uniform distribution of the vaporized metal organic precursor in the fluidized bed reactor (14) and a uniform distribution of vaporized metal organic precursor on the surface of the particles through adsorption.

Preconditioning of particles by adjustment of the OH-group concentration and the addition of reactive gases such as oxygen or hydrogen (1-5% by Volume) lead to a decomposition of the precursors on the support, so as to form platinum dots in a single step. The crucial parameters for product control (i.e. for controlling structure and shape of product particles comprising platinum dots on silica support particles, for controlling the size distribution and number of platinum dots on the particle surfaces, etc.) are the concentration of the platinum precursor (1-100 ppm), the coating duration (2-60 min), the reaction temperature (50-500 °C), and the OH-group concentration of the particle surface (2-15 groups/nm 2 ). The concentration of OH groups on the surface can be adjusted by treating the particles in a fluidized bed reactor with water vapor or dry inert gases. For a reduction of the OH group concentration heating in inert gases at 300-500°C for 10-60 min was carried out. To increase the OH-group concentration, treatment of the oxide powders in water vapor (1-5% by Volume) at temperatures ranging from 200-500°C was carried out. The determination of OH-group concentration can be done by thermogravimetric analysis, Si-NMR, H-NMR or by titration.

Experiments using dichlorido-n 4 -((1 Z,5Z)-1-methylcycloocta-1 ,5-dien) platinum, diiodido- H 4 -((1Z,5Z)-1-methylcycloocta-1 ,5-dien) platinum, dimethyl-n 4 -((1Z,5Z)-1-methylcycloocta- 1 ,5-dien) platinum, n 4 -((1 Z,5Z)-1-methylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido- H 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien) platinum, r| 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5- dien)diiodido platinum, n 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)dimethyl platinum, η 4 - ((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido-r| 4 -((1 E,5Z)-1- phenylcycloocta-1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, dimethyl-n 4 -((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, diphenyl-η 4 - ((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, dichlorido-r| 4 -((1 E,5Z)-1- isopropylcycloocta-1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-lsopropylcycloocta-1 ,5-dien) platinum, n 4 -((1 E,5Z)-1-isopropylcycloocta-1 ,5-dien)dimethyl platinum, η 4 -((1Ζ,5Ζ)-1- isopropylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido-n 4 -((1 E,5Z)-1-n-butylcycloocta- 1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum, dimethyl- n. 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum, diphenyl-n. 4 -((1 E,5Z)-1-n- butylcycloocta-1 ,5-dien) platinum, dichlorido-n 4 -((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, dimethyl-η 4 - ((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, diphenyl-n. 4 -((1 E,5Z)-1-iso- butylcycloocta-1 ,5-dien) platinum, dichlorido-n 4 -((1 E,5Z)-1-n-hexylcycloocta-1 ,5-diene) platinum, diiodido-n. 4 -((1 E,5Z)-1-n-hexylcycloocta-1 ,5-diene) platinum, and η 4 -((1 Ε,5Ζ)-1- n-hexylcycloocta-1 ,5-diene)dimethylplatinum as precursor show similar results.

Alternative b)

In a variation of alternative a) the CVD process is carried out in two steps. The absorption of the vaporized metal organic precursor is carried out in a first step and the decomposition reaction is carried out in a second step. In the first step the synthesized nanometer-sized silica support particles (Si0 2 -Particles) are fluidized in a fluidized bed reactor (14) and the vaporized metal organic precursor is subsequently transferred through a heated transfer pipe (7) into the fluidized bed reactor (14). For this (1-ethyl-COD)PtMe 2 , a solid precursor, was stored at -23°C under argon in a closed flask. The precursor was inserted into a glove-box containing a microbalance. Under argon atmosphere 10-12 mg of the precursor was weighed into an Al 2 0 3 boat and transferred afterwards in a closed vessel to a precursor sublimator (5). The (1-ethyl- COD)PtMe 2 in the boat is vaporized into a flow of nitrogen (150 ml/min) in the precursor sublimator (5) at 100°C. The fluidized bed reactor (14) had an inner diameter of 70 mm and a height of 800 cm and was electrically heated. The reaction temperature can be varied in the range of 50 to 500°C. The main fluidization flow entered the reactor through a glass frit at the bottom end and was varied between 2 and 20 l/min. Fluidization requires the break-up of large agglomerates, which can be achieved by vibration, a small (0.2-1 l/min) but high velocity (10-100 m/s) gas flow produced by a small orifice (200-600 μιτι) mounted to a lance (15) which is inserted into the particle bed, or other measures. Intensive intermixing of the fluidized particles ensures a uniform distribution of the vaporized metal organic precursor in the fluidized bed reactor (14) and a uniform distribution of vaporized metal organic precursor on the surface of the particles through adsorption. The absorption can be monitored with appropriate measurement methods (FTIR, GC, MS) in the effluent gas from the fluidized bed reactor (14). After saturation of the particle surfaces with the metal organic precursor, the fluidized bed reactor (14) is flushed with an inert gas to remove metal organic precursors that are not adsorbed. Afterwards a reactive gas such as water vapor (1-10% by volume in inert gas) is added to the carrier gas flow which prompts the decomposition of the metal organic precursor and initiates the formation of (three-dimensional) dots. The process in two steps allows an adsorption and a reaction under different pressure and temperature conditions, so that the surface structure can be manipulated in different ways.

Experiments using dichlorido-n 4 -((1 Z,5Z)-1-methylcycloocta-1 ,5-dien) platinum, diiodido- n 4 -((1Z,5Z)-1-methylcycloocta-1 ,5-dien) platinum, dimethyl-n 4 -((1Z,5Z)-1-methylcycloocta- 1 ,5-dien) platinum, n 4 -((1 Z,5Z)-1-methylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido- H 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien) platinum, r) 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5- dien)diiodido platinum, r| 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)dimethyl platinum, η 4 - ((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido-r| 4 -((1 E,5Z)-1- phenylcycloocta-1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, dimethyl-n 4 -((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, diphenyl-η 4 - ((1 E,5Z)-1-phenylcycloocta-1 ,5-dien) platinum, dichlorido-r| 4 -((1 E,5Z)-1- isopropylcycloocta-1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-lsopropylcycloocta-1 ,5-dien) platinum, n 4 -((1 E,5Z)-1-isopropylcycloocta-1 ,5-dien)dimethyl platinum, η 4 -((1Ζ,5Ζ)-1- isopropylcycloocta-1 ,5-dien)diphenyl platinum, dichlorido-n 4 -((1 E,5Z)-1-n-butylcycloocta- 1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum, dimethyl- H 4 -((1 E,5Z)-1-n-butylcycloocta-1 ,5-dien) platinum, diphenyl-n. 4 -((1 E,5Z)-1-n- butylcycloocta-1 ,5-dien) platinum, dichlorido-n 4 -((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, diiodido-n 4 -((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, dimethyl-η 4 - ((1 E,5Z)-1-iso-butylcycloocta-1 ,5-dien) platinum, diphenyl-n. 4 -((1 E,5Z)-1-iso- butylcycloocta-1 ,5-dien) platinum, dichlorido-n 4 -((1 E,5Z)-1-n-hexylcycloocta-1 ,5-diene) platinum, diiodido-n 4 -((1 E,5Z)-1-n-hexylcycloocta-1 ,5-diene) platinum, and η 4 -((1 Ε,5Ζ)-1- n-hexylcycloocta-1 ,5-diene)dimethylplatinum as precursor show similar results. Example 36: Synthesis of Pt-nanoparticles by fixed bed MOCVD:

The experimental setup is shown in Fig. 7.

For a standard coating experiment 50 to 70 mg of commercial nanoscale support particles (e.g. from Evonik) were filled inside the reactor. The average primary particle size diameters (d S up P ort) of the support nanoparticles are in the range of from 12 to 40 nm (see Table 1 below, also for additional nanoparticle characteristics). In order to remove all of the physisorbed water on the support nanoparticle surfaces, the fixed bed was heated to 150 °C for 1 h under flowing nitrogen. Subsequently the precursor MeCpPtMe 3 was introduced into the fixed bed which was held at 150°C. Precursor evaporation at 40°C and a N 2 stream of 50 ml/min were applied. After an exposure to the precursor of 30 min, both three way valves were switched over and the organic ligands were oxidative removed for 30 min at 300 °C and 30 ml/min 0 2 . Afterwards the support nanoparticles were again treated with precursor or oxygen, cyclically switched until the entire precursor (8 mg) was consumed, while a time of exposure of 30 min was chosen. Results of the above described fixed bed MOCVD:

The results of Example 36 are shown below in Table 1 , and Fig. 8 and 9. The following abbreviations and terms are used in Table 1 below:

"Support" material used as substrate

dsupport average primary particle size diameter of the material used substrate

"OH-density" density of hydroxyl groups on the surface of the support

"dpt" median particle size diameter of the Pt-particles deposited the substrate surfaces

"Dispersion" molar fraction of exposed Pt

TEM observation showed narrow size distributions for the platinum nanoparticles on the metal oxide support.

Very small median particle size diameters of 1 .9 nm and a high dispersion of 58 % were measured for Pt-Al 2 0 3 synthesized by fixed bed MOCVD (see Table 1 , Fig. 8 and 9A).

The Pt-islands synthesized on Ti0 2 (P25) (see Fig. 9B) and silica (see Fig. 9C) were also narrowly distributed but larger in size (4 to 5 nm, respectively, see Table 1 )·

This difference in median particle size diameter (d R ) may be the result of different properties of the support particle surface. XPS measurements complete the observation on the particles produced by fixed bed MOCVD. The presence of Pt°, Pt 2+ and Pt 4+ was observed by XPS. The binding energies measured for platinum (Pt 4f 7/2 = 71.2 eV / Pt°, 72.8 eV / Pt 2+ ; and 74.5 eV / Pt 4+ ) are in a good agreement with reference data and close to those reported in the literature. Table 1 Properties of support and platinum particles produced by fixed bed MOCVD.

OH- t

Support dsupport Lewis- BET * density dpt Dispersion

nm Acidity m 2 /g 1/nm 2 nm %

Aeroxide Alu C

(Al 2 0 3 )

13 weak base 100±15 8.5 - 9.2 1 .9 58

Aeroxide P25

(Ti0 2 )

21 acid/base 50±15 5 4.2 26

Aerosil Ox50

(Si0 2 )

40 acid 50±15 2.1 4.7 23

Aerosil 200

(Si0 2 ) 12 acid 200±25 2.7 4.6 24

*given by the producer (Evonik)

The dispersion D (the molar fraction of exposed Pt) was calculated from the particle size using the equation given by Anderson* (and multiplied by 100 in order to obtain values in percent): with the effective average area occupied by a Pt-atom in the surface a pt of 0.0807 nm 2 and with the volume per Pt-atom in the bulk u f f , of 0.01506 nm 3 .

* J.R. Anderson, "Measurement Techniques: Surface Area, Particle Size and Pore Structure" in Structure of metal catalysts, Academic Press Inc, London, UK, 1975, Chpt. 6, pp. 296 and 360

Comparative Example 1 : Pt/SiOp-Particles

The particles were prepared according to the procedure defined in example 32 above, with the exception that instead of n 4 -((1Z,5Z)-1-ethylcycloocta-1 ,5-dien)dimethyl platinum (Trimethyl)methylcylopendadienylplatinum was used as a precursor. The resulting product (Si0 2 particles having platinum dots on their surface) is analyzed by TEM. A TEM photography of one particle having platinum dots on its surface is shown in Fig. 4.

A comparison of Fig. 3 and 4 shows that the method of example 22 in which a compound of the present invention is used as a precursor results in particles having dots with narrow size distribution, typical dot diameters being below 5nm. In contrast, the method of comparative example 1 in which a compound is used as a precursor which is not a compound of the present invention results in particles having comparatively large dots with a broad size distribution. The product of the present invention as depicted in Fig. 3 can be used as a catalyst or as catalytically active component of a catalyst system. The product is characterized by a large platinum surface area achieved with a low mass of platinum deposited, i.e. the ratio of platinum surface area to platinum mass deposited is particularly favorable.