Organic semiconducting materials can be used in electronic devices such as organic photo- voltaic devices (OPVs), organic field-effect transistors (OFETs), organic light emitting diodes (OLEDs), and organic electrochromic devices (ECDs).

For efficient and long lasting performance, it is desirable that the organic semiconducting material-based devices show high charge carrier mobility as well as high stability, in particular to- wards oxidation by air, under ambient environmental conditions.

Furthermore, it is desirable that the organic semiconducting materials are compatible with liquid processing techniques such as spin coating as liquid processing techniques are convenient from the point of processability, and thus allow the production of low cost organic semiconduct- ing material-based electronic devices. In addition, liquid processing techniques are also compatible with plastic substrates, and thus allow the production of light weight and mechanically flexible organic semiconducting material-based electronic devices.

The use of organic semiconducting materials is known in the art.

Bao, Z.; Dobadalapur, A.; Lovinger, A. J. Appl. Phys. Lett. 1996, 69, 4108-41 10 describes the use of regioregular poly(3-hexylthiophene) in field-effect transistors.

Ong, B. S.; Wu,Y.; Liu, P.; Gardner, S. J. Am. Chem. Soc. 2004, 126, 3378-3379 describes polymers of formula

for use in organic field effect transistors (OFETs).

Zhang, M.; Tsao, H. N.; Pisula, W.; Yang, C; Mishra, A. K.; Mullen, K. J. Am. Chem. Soc. 2007, 129, 3472-3473 describes polymers of formula

for use in organic field effect transistors (OFETs). Zou, Y.; Najari, A.; Berrouard, P.; Beaupre, S.; Badrou, R. A.; Tao, Y.; Leclerc, M. J. Am. Chem. Soc. 2010, 132, 5330-5331 describes polymers of formula

as donor materials for use in photovoltaic devices.

L. Burgi, M. Turbiez, R. Pfeiffer, F. Bienewald, H.-J. Kirner, C. Winnewisser, Adv. Mater. 2008, 20, 2217-2224 describes polymers of formula

for use in organic field effect transistors (OFETs).

J. C. Bijleveld, A. P. Zoombelt, S. G. J. Mathijssen, M. M. Wienk, M. Turbiez, D. M. de Leeuw, R. A. J. Janssen, J. Am. Chem. Soc. 2009, 131 , 16616-16617 describes polymers of formula

for use in organic field effect transistors (OFETs) and organic photovoltaic devices (OPVs). N. Saito, T. Yamamoto Macromolecules 1995, 28, 4260-4267 describes polymers of formula

as an electrical conductor.

Diketopiperidinopiperidine derivatives are also known in the art.

E. Bisagni, C. Landras, S. Thirot, C. Huel. Tetrahedron, 1996, 52 (31 ), 10427-10440 describes the synthesis of compound of formula

H. Irikawa, N. Adachi Heterocycles 2000, 53 (1 ), 135-142 describes the synthesis of compound of formula

X = NMe, O

Ar = C ₆ H ₅ , 2-MeC ₆ H ₄ , 2,4,6-Me '3,C _R 6H' ',2

It was the object of the present invention to provide new organic semiconducting materials. This object is solved by the polymer of claim 1 and the electronic device of claim 17. The semiconducting material of the present invention is a polymer comprising a unit of formula

wherein

R ¹ and R ² are independently from each other H, Ci-30-alkyl optionally substituted with 1 to 6 substituents R ^c , C2-3o-alkenyl optionally substituted with 1 to 6 substituents R ^c , C2-3o-alkynyl optionally substituted with 1 to 6 substituents R ^c , C3-io-cycloalkyl optionally substituted with 1 to 6 substituents R ^d , Cs-io-cycloalkenyl optionally substituted with 1 to 6 substituents R ^d , monovalent 3 to 14 membered aliphatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^d , C6-i4-aryl optionally substituted with 1 to 6 substituents R ^e or monovalent 5 to14 membered aromatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^e , wherein

R ^c at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0- Ci-io-alkyl, -O-COR ³ , -S-Ci-10-alkyl, -NH ₂ , -NHR ³ , -NR ³ R ⁴ , -NH-COR ³ , -COOH, -COOR ³ , - CONH ₂ , -CONHR ³ , -CONR ³ R ⁴ , -CO-H, -COR ³ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; R ^d at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -NO2, -OH, Ci-10-alkoxy,

-0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ³ , -S-Ci-10-alkyl, -NH ₂ , -NHR ³ , -NR ³ R ⁴ , -NH-COR ³ , -COOH, -COOR ³ , -CONH2, -CONHR ³ , -CONR ³ R ⁴ , -CO-H, -COR ³ , Ci-10-alkyl, C ₂ -io-alkenyl,

C2-io-alkynyl, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue;

R ^e at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -NO2, -OH, Ci-10-alkoxy, -O-CH2CH2O- Ci-10-alkyl, -O-COR ³ , -S-Ci-10-alkyl, -NH ₂ , -NHR ³ , -NR ³ R ⁴ , -NH-COR ³ , -COOH, -COOR ³ , - CONH2, -CONHR ³ , -CONR ³ R ⁴ , -CO-H, -COR ³ , Ci-10-alkyl, C ₂ -io-alkenyl, C ₂ -io-alkynyl, C3-10- cycloalkyl, Cs-io-cycloalkenyl and monovalent 3 to 14 membered aliphatic heterocyclic residue, wherein R ³ and R ⁴ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C2-io-alkenyl, C2-io-alkynyl, -io-cycloalkyl, Cs-io-cyclo- alkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue,

G ¹ and G ² are independently from each other -i4-arylene optionally substituted with 1 to 6 substituents R ^a or bivalent 5 to 14 membered aromatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^a , wherein

R ^a at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci- ₃₀ -alkoxy,

-0-CH ₂ CH ₂ 0-Ci-3o-alkyl, -O-COR ⁸ , -S-Ci _-3 o-alkyl, -NH ₂ , -NHR ⁸ , -NR ⁸ R ⁹ , -NH-COR ⁸ , -COOH, -COOR ⁸ , -CONH ₂ , -CONHR ⁸ , -CONR ⁸ R ⁹ , -CO-H, -COR ⁸ , Ci-so-alkyl optionally substituted with 1 to 6 substituents R ^f , C _2- 3o-alkenyl optionally substituted with 1 to 6 substituents R ^f , C _2- 3o-alkynyl optionally substituted with 1 to 6 substituents R ^f , -io-cycloalkyl optionally substituted with 1 to 6 substituents Rs, Cs-io-cycloalkenyl optionally substituted with 1 to 6 substituents Rs and monovalent 3 to 14 membered aliphatic heterocyclic residue optionally substituted with 1 to 6 substituents Rs, wherein

R ⁸ and R ⁹ at each occurrence are independently from each other selected from the group consisting of Ci-30-alkyl, C _2- 3o-alkenyl, C _2- 3o-alkynyl, -io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue,

R ^f at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁰ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁰ , -NR ⁰ R ¹¹ , -NH-COR ¹⁰ -COOH, -COOR ¹⁰ , -CONH ₂ , -CONHR ¹⁰ , -CONR ⁰ R ¹¹ , -CO-H, -COR ¹⁰ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue;

Ra at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁰ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁰ , -NR ⁰ R ¹¹ , -NH-COR ¹⁰ -COOH, -COOR ¹⁰ , -CONH ₂ , -CONHR ¹⁰ , -CONR ⁰ R ¹¹ , -CO-H, -COR ¹⁰ , Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, -i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; wherein R ¹⁰ and R ¹¹ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, Ce-14-aryl and monovalent 5 to14 membered aromatic heterocyclic residue, or

G ¹ and G ² are independently from each other

wherein

R ⁵ and R ⁶ are independently from each other H or Ci

is C6-24-arylene optionally substituted with 1 to 6 substituents R ^b or bivalent 5 to 24 membered aromatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^b , wherein

R ^b at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci- ₃₀ -alkoxy,

-0-CH ₂ CH ₂ 0-Ci-3o-alkyl, -O-COR ¹² , -S-Ci _-3 o-alkyl, -NH ₂ , -NHR ¹² , -NR ¹² R ¹³ , -NH-COR ¹² , -COOH, -COOR ¹² , -CONH ₂ , -CONHR ² , -CONR ² R ¹³ , -CO-H, -COR ¹² , Ci-so-alkyl optionally substituted with 1 to 6 substituents R ^h , C _2- 3o-alkenyl optionally substituted with 1 to 6 substituents R ^h , C _2- 3o-alkynyl optionally substituted with 1 to 6 substituents R ^h , C3-io-cyclo- alkyl optionally substituted with 1 to 6 substituents R', Cs-io-cycloalkenyl optionally substituted with 1 to 6 substituents R' and monovalent 3 to 14 membered aliphatic heterocyclic residue optionally substituted with 1 to 6 substituents R', wherein

R ¹² and R ¹³ at each occurrence are independently from each other selected from the group consisting of Ci-30-alkyl, C _2- 3o-alkenyl, C _2- 3o-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue,

R ^h at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ -e-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁴ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁴ , -NR R ¹⁵ , -NH-COR ¹⁴ , -COOH, -COOR ¹⁴ , -CONH ₂ , -CONHR ¹⁴ , -CONR R ¹⁵ , -CO-H, -COR ¹⁴ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue;

R' at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN , -N0 ₂ , -OH , Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁴ , -S-Ci-10-alkyl, -N H ₂ , -N H R ¹⁴ , -N R ¹⁴ R ¹⁵ , -N H-COR ¹⁴ , -COOH , -COOR ¹⁴ , -CON H ₂ , -CON H R ⁴ , -CON R R ¹⁵ , -CO-H , -COR ¹⁴ , Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; wherein R ¹⁴ and R ¹⁵ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue, or

L is

wherein

R ¹⁶ and R ¹⁷ are independently from each other H , Ci-30-alkyl, -CN or halogen,

q and s are independently from each other 0, 1 , 2, 3, 4 or 5, r is 0, 1 or 2, and n is an integer from 2 to 10Ό00.

Preferably, the semiconducting material of the present invention is a polymer consisting essentially of a unit of formula wherein R ¹ and R ² are independently from each other H , Ci-30-alkyl optionally substituted with 1 to 6 substituents R ^c , C2-3o-alkenyl optionally substituted with 1 to 6 substituents R ^c , C2-3o-alkynyl optionally substituted with 1 to 6 substituents R ^c , C3-io-cycloalkyl optionally substituted with 1 to 6 substituents R ^d , Cs-io-cycloalkenyl optionally substituted with 1 to 6 substituents R ^d , monovalent 3 to 14 membered aliphatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^d , C6-i4-aryl optionally substituted with 1 to 6 substituents R ^e or monovalent 5 to14 membered aromatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^e , wherein

R ^c at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN , -N0 ₂ , -OH , Ci-10-alkoxy, -0-CH ₂ CH ₂ 0- Ci-io-alkyl, -O-COR ³ , -S-Ci-10-alkyl, -N H ₂ , -N H R ³ , -N R ³ R ⁴ , -N H-COR ³ , -COOH , -COOR ³ , - CON H ₂ , -CON H R ³ , -CON R ³ R ⁴ , -CO-H , -COR ³ , C ₃ -io-cycloalkyl, monovalent 3 to 14 mem- bered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue;

R ^d at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN , -NO2, -OH , Ci-10-alkoxy,

-0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ³ , -S-Ci-10-alkyl, -N H ₂ , -N H R ³ , -N R ³ R ⁴ , -N H-COR ³ , -COOH , -COOR ³ , -CON H2, -CON H R ³ , -CON R ³ R ⁴ , -CO-H , -COR ³ , Ci-10-alkyl, C ₂ -io-alkenyl,

C2-io-alkynyl, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue;

R ^e at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN , -NO2, -OH , Ci-10-alkoxy, -O-CH2CH2O- Ci-10-alkyl, -O-COR ³ , -S-Ci-10-alkyl, -N H ₂ , -N H R ³ , -N R ³ R ⁴ , -N H-COR ³ , -COOH , -COOR ³ , - CON H2, -CON H R ³ , -CON R ³ R ⁴ , -CO-H , -COR ³ , Ci-10-alkyl, C ₂ -io-alkenyl, C ₂ -io-alkynyl, C3-10- cycloalkyl, Cs-io-cycloalkenyl and monovalent 3 to 14 membered aliphatic heterocyclic residue, wherein R ³ and R ⁴ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C2-io-alkenyl, C2-io-alkynyl, C3-io-cycloalkyl, Cs-io-cyclo- alkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue,

G ¹ and G ² are independently from each other C6-i4-arylene optionally substituted with 1 to 6 substituents R ^a or bivalent 5 to 14 membered aromatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^a , wherein

R ^a at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci- ₃₀ -alkoxy,

-0-CH ₂ CH ₂ 0-Ci-3o-alkyl, -O-COR ⁸ , -S-Ci _-3 o-alkyl, -NH ₂ , -NHR ⁸ , -NR ⁸ R ⁹ , -NH-COR ⁸ , -COOH, -COOR ⁸ , -CONH ₂ , -CONHR ⁸ , -CONR ⁸ R ⁹ , -CO-H, -COR ⁸ , Ci-so-alkyl optionally substituted with 1 to 6 substituents R ^f , C _2- 3o-alkenyl optionally substituted with 1 to 6 substituents R ^f , C _2- 3o-alkynyl optionally substituted with 1 to 6 substituents R ^f , C3-io-cycloalkyl optionally substituted with 1 to 6 substituents Rs, Cs-io-cycloalkenyl optionally substituted with 1 to 6 substituents Rs and monovalent 3 to 14 membered aliphatic heterocyclic residue optionally substituted with 1 to 6 substituents Rs, wherein

R ⁸ and R ⁹ at each occurrence are independently from each other selected from the group consisting of Ci-30-alkyl, C _2- 3o-alkenyl, C _2- 3o-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue, R ^f at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁰ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁰ , -NR ⁰ R ¹¹ , -NH-COR ¹⁰ , -COOH, -COOR ¹⁰ , -CONH ₂ , -CONHR ¹⁰ , -CONR ⁰ R ¹¹ , -CO-H, -COR ¹⁰ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monova- lent 5 to 14 membered aromatic heterocyclic residue;

Ra at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁰ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁰ , -NR ⁰ R ¹¹ , -NH-COR ¹⁰ , -COOH, -COOR ¹⁰ , -CONH ₂ , -CONHR ¹⁰ , -CONR ⁰ R ¹¹ , -CO-H, -COR ¹⁰ , Ci-10-alkyl,

C _2- io-alkenyl, C _2- io-alkynyl, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; wherein R ¹⁰ and R ¹¹ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic hetero- cyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue, or

G ¹ and G ² are independently from each other

wherein

R ⁵ and R ⁶ are independently from each other H or Ci-30-alkyl,

L is C6-24-arylene optionally substituted with 1 to 6 substituents R ^b or bivalent 5 to 24 membered aromatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^b , wherein

R ^b at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci- ₃₀ -alkoxy,

-0-CH ₂ CH ₂ 0-Ci-3o-alkyl, -O-COR ¹² , -S-Ci _-3 o-alkyl, -NH ₂ , -NHR ¹² , -NR ¹² R ¹³ , -NH-COR ¹² ,

-COOH, -COOR ¹² , -CONH ₂ , -CONHR ² , -CONR ² R ¹³ , -CO-H, -COR ¹² , Ci-so-alkyl optionally substituted with 1 to 6 substituents R ^h , C _2- 3o-alkenyl optionally substituted with 1 to 6 substituents R ^h , C _2- 3o-alkynyl optionally substituted with 1 to 6 substituents R ^h , C3-io-cyclo- alkyl optionally substituted with 1 to 6 substituents R', Cs-io-cycloalkenyl optionally substi- tuted with 1 to 6 substituents R' and monovalent 3 to 14 membered aliphatic heterocyclic residue optionally substituted with 1 to 6 substituents R', wherein

R ¹² and R ¹³ at each occurrence are independently from each other selected from the group consisting of Ci-30-alkyl, C _2- 3o-alkenyl, C _2- 3o-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue,

R ^h at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy,

-0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁴ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁴ , -NR R ¹⁵ , -NH-COR ¹⁴ , -COOH, -COOR ¹⁴ , -CONH ₂ , -CONHR ¹⁴ , -CONR R ¹⁵ , -CO-H, -COR ¹⁴ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; R' at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁴ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁴ , -NR ¹⁴ R ¹⁵ , -NH-COR ¹⁴ , -COOH, -COOR ¹⁴ , -CONH ₂ , -CONHR ⁴ , -CONR R ¹⁵ , -CO-H, -COR ¹⁴ , Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; wherein R ¹⁴ and R ¹⁵ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue,

wherein

R ¹⁶ and R ¹⁷ are independently from each other H, Ci-30-alkyl, -CN or halogen,

q and s are independently from each other 0, 1 , 2, 3, 4 or 5, r is 0, 1 or 2, and n is an integer from 2 to 10Ό00.

The term "consisting essentially of" means that at least 80% by weight. Preferably at least 90% by weight, of the polymer consists of a unit of formula (1 ) based on the weight of the polymer.

More preferably, the semiconducting material of the present invention is a polymer of formula wherein R ¹ and R ² are independently from each other H , Ci-30-alkyl optionally substituted with 1 to 6 substituents R ^c , C2-3o-alkenyl optionally substituted with 1 to 6 substituents R ^c , C2-3o-alkynyl optionally substituted with 1 to 6 substituents R ^c , C3-io-cycloalkyl optionally substituted with 1 to 6 substituents R ^d , Cs-io-cycloalkenyl optionally substituted with 1 to 6 substituents R ^d , monovalent 3 to 14 membered aliphatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^d , C6-i4-aryl optionally substituted with 1 to 6 substituents R ^e or monovalent 5 to14 membered aromatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^e , wherein

R ^c at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN , -N0 ₂ , -OH , Ci-10-alkoxy, -0-CH ₂ CH ₂ 0- Ci-io-alkyl, -O-COR ³ , -S-Ci-10-alkyl, -N H ₂ , -N H R ³ , -N R ³ R ⁴ , -N H-COR ³ , -COOH , -COOR ³ , - CON H ₂ , -CON H R ³ , -CON R ³ R ⁴ , -CO-H , -COR ³ , C ₃ -io-cycloalkyl, monovalent 3 to 14 mem- bered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue;

R ^d at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN , -NO2, -OH , Ci-10-alkoxy,

-0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ³ , -S-Ci-10-alkyl, -N H ₂ , -N H R ³ , -N R ³ R ⁴ , -N H-COR ³ , -COOH , -COOR ³ , -CON H2, -CON H R ³ , -CON R ³ R ⁴ , -CO-H , -COR ³ , Ci-10-alkyl, C ₂ -io-alkenyl,

C2-io-alkynyl, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue;

R ^e at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN , -NO2, -OH , Ci-10-alkoxy, -O-CH2CH2O- Ci-10-alkyl, -O-COR ³ , -S-Ci-10-alkyl, -N H ₂ , -N H R ³ , -N R ³ R ⁴ , -N H-COR ³ , -COOH , -COOR ³ , - CON H2, -CON H R ³ , -CON R ³ R ⁴ , -CO-H , -COR ³ , Ci-10-alkyl, C ₂ -io-alkenyl, C ₂ -io-alkynyl, C3-10- cycloalkyl, Cs-io-cycloalkenyl and monovalent 3 to 14 membered aliphatic heterocyclic residue, wherein R ³ and R ⁴ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C2-io-alkenyl, C2-io-alkynyl, C3-io-cycloalkyl, Cs-io-cyclo- alkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue,

G ¹ and G ² are independently from each other -i4-arylene optionally substituted with 1 to 6 substituents R ^a or bivalent 5 to 14 membered aromatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^a , wherein

R ^a at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci- ₃₀ -alkoxy,

-0-CH ₂ CH ₂ 0-Ci-3o-alkyl, -O-COR ⁸ , -S-Ci _-3 o-alkyl, -NH ₂ , -NHR ⁸ , -NR ⁸ R ⁹ , -NH-COR ⁸ , -COOH, -COOR ⁸ , -CONH ₂ , -CONHR ⁸ , -CONR ⁸ R ⁹ , -CO-H, -COR ⁸ , Ci-so-alkyl optionally substituted with 1 to 6 substituents R ^f , C _2- 3o-alkenyl optionally substituted with 1 to 6 substituents R ^f , C _2- 3o-alkynyl optionally substituted with 1 to 6 substituents R ^f , C3-io-cycloalkyl optionally substituted with 1 to 6 substituents Rs, Cs-io-cycloalkenyl optionally substituted with 1 to 6 substituents Rs and monovalent 3 to 14 membered aliphatic heterocyclic residue optionally substituted with 1 to 6 substituents Rs, wherein

R ⁸ and R ⁹ at each occurrence are independently from each other selected from the group consisting of Ci-30-alkyl, C _2- 3o-alkenyl, C _2- 3o-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue, R ^f at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁰ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁰ , -NR ⁰ R ¹¹ , -NH-COR ¹⁰ , -COOH, -COOR ¹⁰ , -CONH ₂ , -CONHR ¹⁰ , -CONR ⁰ R ¹¹ , -CO-H, -COR ¹⁰ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monova- lent 5 to 14 membered aromatic heterocyclic residue;

Ra at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁰ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁰ , -NR ⁰ R ¹¹ , -NH-COR ¹⁰ , -COOH, -COOR ¹⁰ , -CONH ₂ , -CONHR ¹⁰ , -CONR ⁰ R ¹¹ , -CO-H, -COR ¹⁰ , Ci-10-alkyl,

C _2- io-alkenyl, C _2- io-alkynyl, -i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; wherein R ¹⁰ and R ¹¹ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic hetero- cyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue, or

G ¹ and G ² are independently from each other

wherein

R ⁵ and R ⁶ are independently from each other H or Ci-30-alkyl,

L is C6-24-arylene optionally substituted with 1 to 6 substituents R ^b or bivalent 5 to 24 membered aromatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^b , wherein

R ^b at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci- ₃₀ -alkoxy,

-0-CH ₂ CH ₂ 0-Ci-3o-alkyl, -O-COR ¹² , -S-Ci _-3 o-alkyl, -NH ₂ , -NHR ¹² , -NR ¹² R ¹³ , -NH-COR ¹² ,

-COOH, -COOR ¹² , -CONH ₂ , -CONHR ² , -CONR ² R ¹³ , -CO-H, -COR ¹² , Ci-so-alkyl optionally substituted with 1 to 6 substituents R ^h , C _2- 3o-alkenyl optionally substituted with 1 to 6 substituents R ^h , C _2- 3o-alkynyl optionally substituted with 1 to 6 substituents R ^h , C3-io-cyclo- alkyl optionally substituted with 1 to 6 substituents R', Cs-io-cycloalkenyl optionally substi- tuted with 1 to 6 substituents R' and monovalent 3 to 14 membered aliphatic heterocyclic residue optionally substituted with 1 to 6 substituents R', wherein

R ¹² and R ¹³ at each occurrence are independently from each other selected from the group consisting of Ci-30-alkyl, C _2- 3o-alkenyl, C _2- 3o-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue,

R ^h at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy,

-0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁴ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁴ , -NR R ¹⁵ , -NH-COR ¹⁴ , -COOH, -COOR ¹⁴ , -CONH ₂ , -CONHR ¹⁴ , -CONR R ¹⁵ , -CO-H, -COR ¹⁴ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; R' at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁴ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁴ , -NR ¹⁴ R ¹⁵ , -NH-COR ¹⁴ , -COOH, -COOR ¹⁴ , -CONH ₂ , -CONHR ⁴ , -CONR R ¹⁵ , -CO-H, -COR ¹⁴ , Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; wherein R ¹⁴ and R ¹⁵ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue,

wherein

R ¹⁶ and R ¹⁷ are independently from each other H, Ci-30-alkyl, -CN or halogen,

q and s are independently from each other 0, 1 , 2, 3, 4 or 5, r is 0, 1 or 2, and n is an integer from 2 to 10Ό00.

Ci-12-alkyl, Ci-16-alkyl, C6- ₂ o-alkyl and Ci-30-alkyl can be branched or unbranched. Examples of Ci-12-alkyl are Ci-10-alkyl and n-undecyl and n-dodecyl. Examples of Ci-16-alkyl are Ci-i ₂ -alkyl and n-tridecyl, n-tetradecyl, n-pentadecyl and n-hexadecyl. Examples of Ci-30-alkyl are

Ci-io-alkyl, and n-undecyl, n-dodecyl, n-tridecyl, n-tetradecyl, n-pentadecyl, n-hexadecyl, n-heptadecyl, n-octadecyl, n-nonadecyl and n-icosyl (C ₂₀ ), n-docosyl (C ₂₂ ), n-tetracosyl (C ₂₄ ), n-hexacosyl (C ₂ 6) , n-octacosyl (C ₂ s) and n-triacontyl (C30). Examples of C6- ₂ o-alkyl are n-hexyl, n-heptyl, n-octyl, n-(2-ethyl)hexyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl, n-undecyl, n-dodecyl, n-tridecyl, n-tetradecyl, n-pentadecyl, n-hexadecyl, n-heptadecyl, n-octadecyl, n-nonadecyl and n-icosyl (C20) C2-io-alkenyl and C2-3o-alkenyl can be branched or unbranched. Examples of C2-io-alkenyl are vinyl, propenyl, c/s-2-butenyl, frans-2-butenyl, 3-butenyl, c/s-2-pentenyl, frans-2-pentenyl, c/s-3-pentenyl, frans-3-pentenyl, 4-pentenyl, 2-methyl-3-butenyl, hexenyl, heptenyl, octenyl, nonenyl and docenyl. Examples of C2-3o-alkenyl are C2-io-alkenyl, and linoleyl (ds), linolenyl (Cis), oleyl (Cis), arachidonyl (C20), and erucyl (C22).

C2-io-alkynyl and C2-3o-alkynyl can be branched or unbranched. Examples of C2-io-alkynyl are ethynyl, 2-propynyl, 2-butynyl, 3-butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl and de- cynyl. Examples of C2-3o-alkynyl are C2-io-alkynyl, and undecynyl, dodecynyl, undecynyl, dode- cynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonade- cynyl and icosynyl (C20).

Examples of C3-io-cycloalkyl are preferably monocyclic C3-io-cycloalkyls such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl and cyclooctyl, but include also polycyclic C3-io-cycloalkyls such as decalinyl, norbornyl and adamantyl.

Examples of Cs-io-cycloalkenyl are preferably monocyclic Cs-io-cycloalkenyls such as cyclopen- tenyl, cyclohexenyl, cyclohexadienyl and cycloheptatrienyl, but include also polycyclic

Cs-io-cycloalkenyls. Examples of monovalent 3 to 14 membered aliphatic heterocyclic residues are monocyclic monovalent 3 to 8 membered aliphatic cyclic residues and polycyclic, for example bicyclic monovalent 7 to 12 membered aliphatic heterocyclic residues.

Examples of monocyclic monovalent 3 to 8 membered aliphatic heterocyclic residues are mon- ocyclic monovalent 5 membered aliphatic heterocyclic residues containing one heteroatom such as pyrrolidinyl, 1 -pyrrolinyl, 2-pyrrolinyl, 3-pyrrolinyl, tetrahydrofuryl, 2,3-dihydrofuryl, tetrahy- drothiophenyl and 2,3-dihydrothiophenyl, monocyclic monovalent 5 membered aliphatic heterocyclic residues containing two heteroatoms such as imidazolidinyl, imidazolinyl, pyrazolidinyl, pyrazolinyl, oxazolidinyl, oxazolinyl, isoxazolidinyl, isoxazolinyl, thiazolidinyl, thiazolinyl, isothia- zolidinyl and isothiazolinyl, monocyclic monovalent 5 membered aliphatic heterocyclic residues containing three heteroatoms such as 1 ,2,3-triazolyl, 1 ,2,4-triazolyl and 1 ,4,2-dithiazolyl, monocyclic monovalent 6 membered aliphatic heterocyclic residues containing one heteroatom such as piperidyl, piperidino, tetrahydropyranyl, pyranyl, thianyl and thiopyranyl, monocyclic monovalent 6 membered aliphatic heterocyclic residues containing two heteroatoms such as piperaz- inyl, morpholinyl and morpholino and thiazinyl, monocyclic monovalent 7 membered aliphatic heterocyclic residues containing one hereoatom such as azepanyl, azepinyl, oxepanyl, thi- epanyl, thiapanyl, thiepinyl, and monocyclic monovalent 7 membered aliphatic heterocyclic residues containing two hereoatom such as 1 ,2-diazepinyl and 1 ,3-thiazepinyl.

An example of a bicyclic monovalent 7-12 membered aliphatic heterocyclic residue is decahy- dronaphthyl.

C6-i4-aryl can be monocyclic or polycyclic. Examples of C6-i4-aryl are monocyclic C6-aryl such as phenyl, bicyclic Cg-io-aryl such as 1 -naphthyl, 2-naphthyl, indenyl, indanyl and tetrahy- dronaphthyl, and tricyclic Ci2-i4-aryl such as anthryl, phenanthryl, fluorenyl and s-indacenyl.

The monovalent 5 to 14 membered aromatic heterocyclic residues can be monocyclic monovalent 5 to 8 membered aromatic heterocyclic residues, or polycyclic, for example bicyclic mono- valent 7 to 12 membered, tricyclic monovalent 9 to 14 membered aromatic heterocyclic residue, or tetracyclic monovalent 9 to 14 membered aromatic heterocyclic residues.

Examples of monocyclic monovalent 5 to 8 membered aromatic heterocyclic residues are mon- ocyclic monovalent 5 membered aromatic heterocyclic residues containing one heteroatom such as pyrrolyl, furyl and thiophenyl, monocyclic monovalent 5 membered aromatic heterocyclic residues containing two heteroatoms such as imidazolyl, pyrazolyl, oxazolyl, isoxazolyl, thia- zolyl, isothiazolyl, monocyclic monovalent 5 membered aromatic heterocyclic residues containing three heteroatoms such as 1 ,2,3-triazolyl, 1 ,2,4-triazolyl and oxadiazolyl, monocyclic mono- valent 5 membered aromatic heterocyclic residues containing four heteroatoms such as tetra- zolyl, monocyclic monovalent 6 membered aromatic heterocyclic residues containing one heteroatom such as pyridyl, monocyclic monovalent 6 membered aromatic heterocyclic residues containing two heteroatoms such as pyrazinyl, pyrimidinyl and pyridazinyl, monocyclic monovalent 6 membered aromatic heterocyclic residues containing three heteroatoms such as

1 ,2,3-triazinyl, 1 ,2,4-triazinyl and 1 ,3,5-triazinyl, monocyclic monovalent 7 membered aromatic heterocyclic residues containing one heteroatom such as azepinyl, and monocyclic monovalent 7 membered aromatic heterocyclic residues containing two heteroatoms such as 1 ,2-diazepinyl,

Examples of bicyclic monovalent 7 to 12 membered aromatic heterocyclic residues are bicyclic monovalent 8 membered aromatic heterocyclic residues containing two heteroatoms such as thieno[3,2-b]thiophenyl, bicyclic 9 membered aromatic heterocyclic residues containing one heteroatom such as indolyl, isoindolyl, indolizinyl, indolinyl, benzofuryl, isobenzofuryl, ben- zothiophenyl and isobenzothiophenyl, bicyclic monovalent 9 membered aromatic heterocyclic residues containing two heteroatoms such as indazolyl, benzimidazolyl, benzimidazolinyl, ben- zoxazolyl, benzisooxazolyl, benzthiazolyl, benzisothiazolyl, furopyridyl and thienopyridyl, bicyclic monovalent 9 membered aromatic heterocyclic residues containing three heteroatoms such as benzotriazolyl, benzoxadiazolyl, oxazolopyridyl, isooxazolopyridyl, thiazolopyridyl, isothia- zolopyridyl and imidazopyridyl, bicyclic monovalent 9 membered aromatic heterocyclic residues containing four heteroatoms such as purinyl, bicyclic monovalent 10 membered aromatic heterocyclic residues containing one heteroatom such as quinolyl, isoquinolyl, chromenyl and chromanyl, bicyclic monovalent 10 membered aromatic heterocyclic residues containing two heteroatoms such as quinoxalinyl, quinazolinyl, cinnolinyl, phthalazinyl, 1 ,5-naphthyridinyl and 1 ,8-naphthyridinyl, bicyclic monovalent 10 membered aromatic heterocyclic residues containing three heteroatoms such as pyridopyrazinyl, pyridopyrimidinyl and pyridopyridazinyl, and bicyclic monovalent 10 membered aromatic heterocyclic residues containing four heteroatoms such as pteridinyl.

Examples of tricyclic monovalent 9 to 14 membered aromatic heterocyclic residues are dibenzo- furyl, acridinyl, phenoxazinyl, 7H-cyclopenta[1 ,2-b:3,4-b']dithiophenyl and 4H-cyclopenta- [2,1 -b:3,4-b']dithiophenyl. An example of a tricyclic monovalent 9 to 14 membered aromatic heterocyclic residue containing three heteroatoms is dithienothiophenyl of formula

An example of a tetracyclic monovalent 9 to 14 membered aromatic heterocyclic residue containing four heteroatoms is trithienothiophenyl of formula

Examples of halogen are -F, -CI, -Br and -I.

Examples of Ci-10-alkoxy are methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, sec-butoxy, isobutoxy, fert-butoxy, n-pentoxy, neopentoxy, isopentoxy, hexoxy, n-heptoxy, n-octoxy, n-nonoxy and n-decoxy. Examples of Ci-30-alkoxy are Ci-10-alkoxy, and n-undecoxy,

n-dodecoxy, n-undecoxy, n-dodecoxy, n-tridecoxy, n-tetradecoxy, n-pentadecoxy, n-hexa- decoxy, n-heptadecoxy, n-octadecoxy, n-nonadecoxy and n-icosoxy (C20), n-docosoxy (C22), n-tetracosoxy (C24), n-hexacosoxy (C26), n-octacosoxy (C28) and n-triacontoxy (C30).

Examples of C2-6-alkylene are ethylene, butylene, pentylene, hexylene and 2-methylpentylene. Examples of C6-i4-arylene are monocyclic C6-arylene such as phenylene, bicyclic Cg-io-arylene such as naphthylene, for example

indenylene, for example

_*

indanylene, for example

_*

and tetrahydronaphthylene, for example

_*

and tricyclic Ci2-i4-arylene such as anthrylene, for example

phenanthrylene, for example fluorenylene, for example

and

s-indacenylene, for example

Examples of C6-24-arylene are C6-i4-arylene and pyrenylene, for example

_* tetracenylene, for example

pentacenylene, for example

_*

coronenylene, for example

_*

and tetraphenylenylene, for example

The bivalent 5 to 14 membered aromatic heterocyclic residues can be monocyclic bivalent 5 to 8 membered aromatic heterocyclic residues, or polycyclic, for example bicyclic bivalent 7 to 14 membered, tricyclic bivalent 9 to 14 membered aromatic heterocyclic residues, or tetracyclic bivalent 9 to 14 membered aromatic heterocyclic residues.

Examples of monocyclic bivalent 5 to 8 membered aromatic heterocyclic residues are monocyclic bivalent 5 membered aromatic heterocyclic residues containing one heteroatom such as pyr- rolylene, furylene and thiophenylene, monocyclic bivalent 5 membered aromatic heterocyclic residues containing two heteroatoms such as imidazolylene, pyrazolylene, oxazolylene, isoxa- zolylene, thiazolylene, isothiazolylene, monocyclic bivalent 5 membered aromatic heterocyclic residues containing three heteroatoms such as 1 ,2,3-triazolylene, 1 ,2,4-triazolylene and oxadia- zolylene, monocyclic bivalent 5 membered aromatic heterocyclic residues containing four heteroatoms such as tetrazolylene, monocyclic bivalent 6 membered aromatic heterocyclic residues containing one heteroatom such as pyridylene, monocyclic bivalent 6 membered aromatic heterocyclic residues containing two heteroatoms such as pyrazinylene, pyrimidinylene and pyridazinylene, monocyclic bivalent 6 membered aromatic heterocyclic residues containing three heteroatoms such as 1 ,2,3-triazinylene, 1 ,2,4-triazinylene and 1 ,3,5-triazinylene, monocyclic bivalent 7 membered aromatic heterocyclic residues containing one heteroatom such as azepinylene, and monocyclic bivalent 7 membered aromatic heterocyclic residues containing two heteroatoms such as 1 ,2-diazepinylene.

Examples of bicyclic bivalent 7 to 14 membered aromatic heterocyclic residues are

bicyclic bivalent 8 membered aromatic heterocyclic residues containing two heteroatoms such as thienothiophenylene, for example

bicyclic bivalent 8 membered aromatic heterocyclic residues containing three heteroatoms such as as thienothiazolylene, for example bicyclic bivalent 8 membered aromatic heterocyclic residues containing four heteroatoms such as thiazothiazolylene, for example bicyclic bivalent 9 membered aromatic heterocyclic residues containing one heteroatom such as indolylene, isoindolylene, indolizinylene, indolinylene, isoindolinylene, for example

benzofurylene, isobenzofurylene, benzothiophenylene and isobenzothiophenylene, bicyclic bivalent 9 membered aromatic heterocyclic residues containing two heteroatoms such as indazolylene, benzimidazolylene, benzimidazolinylene, benzoxazolylene, benzisooxa- zolylene, benzthiazolylene, benzisothiazolylene, furopyridylene and thienopyridylene, bicyclic bivalent 9 membered aromatic heterocyclic residues containing three heteroatoms such as benzotriazolylene, benzoxadiazolylene, oxazolopyridylene, isooxazolopyridylene, thia- zolopyridylene, isothiazolopyridylene, imidazopyridylene, benzothiadiazolylene, for example

and dioxanothiophenylene, for example bicyclic bivalent 9 membered aromatic heterocyclic residues containing four heteroatoms such as purinylene, bicyclic bivalent 10 membered aromatic heterocyclic residues containing one heteroatom such as quinolylene, isoquinolylene, chromenylene and chromanylene, bicyclic bivalent 10 membered aromatic heterocyclic residues containing two heteroatoms such as quinoxalinylene, for example

quinazolinylene, cinnolinylene, phthalazinylene, 1 ,5-naphthyridinylene and

1 ,8-naphthyridinylene, bicyclic bivalent 10 membered aromatic heterocyclic residues containing three heteroatoms such as pyridopyrazinylene, pyridopyrimidinylene and pyridopyridazinylene, and bicyclic bivalent 10 membered aromatic heterocyclic residues containing four heteroatoms such as pterid- inylene. Examples of tricyclic bivalent 9 to 14 membered aromatic heterocyclic residues containing one heteroatom are dibenzofurylene, acridinylene, dibenzosilacyclopentadienylene, for example

and dibenzopyrrolylene, for example

Examples of a tricyclic bivalent 9 to 14 membered aromatic heterocyclic residues containing two heteroatoms are phenoxazinylene, and the following compounds

Examples of tricyclic bivalent 9 to 14 membered aromatic heterocyclic residue containing three heteroatoms are the following compounds

Examples of tricyclic bivalent 9 to 14 membered aromatic heterocyclic residue containing four- heteroatoms are the following compounds

An example of a tricyclic bivalent 9 to 14 membered aromatic heterocyclic residue containing heteroatoms is the following compound

An example of a tetracyclic bivalent 9 to 14 membered aromatic heterocyclic residue containing four heteroatoms is the following compound

Examples of bivalent 5 to 24 membered aromatic heterocyclic residues are bivalent 5 to 14 membered aromatic heterocyclic residues, and the following compounds

Examples of L are:

In preferred units of formula (1 )

R ¹ and R ² are independently from each other H, Ci-30-alkyl optionally substituted with 1 to 6 substituents R ^c , C2-3o-alkenyl optionally substituted with 1 to 6 substituents R ^c , C2-3o-alkynyl optionally substituted with 1 to 6 substituents R ^c , -io-cycloalkyl optionally substituted with 1 to 6 substituents R ^d , Cs-io-cycloalkenyl or -i4-aryl optionally substituted with 1 to 6 substituents R ^e , wherein R ^c at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy,

-0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ³ , -S-Ci-10-alkyl, -NH ₂ , -NHR ³ , -NR ³ R ⁴ , -NH-COR ³ , -COOH, -COOR ³ , -CONH ₂ , -CONHR ³ , -CONR ³ R ⁴ , -CO-H, -COR ³ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue;

R ^d at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy,

-0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ³ , -S-Ci-10-alkyl, -NH ₂ , -NHR ³ , -NR ³ R ⁴ , -NH-COR ³ , -COOH, -COOR ³ , -CONH ₂ , -CONHR ³ , -CONR ³ R ⁴ , -CO-H, -COR ³ , Ci-10-alkyl, C _2- io-alkenyl,

C _2- io-alkynyl, -i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue;

R ^e at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy,

-0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ³ , -S-Ci-10-alkyl, -NH ₂ , -NHR ³ , -NR ³ R ⁴ , -NH-COR ³ , -COOH, -COOR ³ , -CONH ₂ , -CONHR ³ , -CONR ³ R ⁴ , -CO-H, -COR ³ , Ci-10-alkyl, C _2- io-alkenyl, C2-io-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl and monovalent 3 to 14 membered aliphatic heterocyclic residue, wherein R ³ and R ⁴ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C2-io-alkenyl, C2-io-alkynyl, C3-io-cycloalkyl,

Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue,

G ¹ and G ² are independently from each other -i4-arylene optionally substituted with 1 to 6 substituents R ^a or bivalent 5 to 14 membered aromatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^a , wherein

R ^a at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci- ₃₀ -alkoxy,

-0-CH ₂ CH ₂ 0-Ci-3o-alkyl, -O-COR ⁸ , -S-Ci _-3 o-alkyl, -NH ₂ , -NHR ⁸ , -NR ⁸ R ⁹ , -NH-COR ⁸ , -COOH, -COOR ⁸ , -CONH ₂ , -CONHR ⁸ , -CONR ⁸ R ⁹ , -CO-H, -COR ⁸ , Ci-so-alkyl optionally substituted with 1 to 6 substituents R ^f , C _2- 3o-alkenyl optionally substituted with 1 to 6 substituents R ^f , C _2- 3o-alkynyl optionally substituted with 1 to 6 substituents R ^f , C3-io-cycloalkyl optionally substituted with 1 to 6 substituents Rs, Cs-io-cycloalkenyl optionally substituted with 1 to 6 substituents Rs and monovalent 3 to 14 membered aliphatic heterocyclic residue optionally substituted with 1 to 6 substituents Rs, wherein

R ⁸ and R ⁹ at each occurrence are independently from each other selected from the group consisting of Ci-30-alkyl, C _2- 3o-alkenyl, C _2- 3o-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue,

R ^f at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁰ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁰ , -NR ⁰ R ¹¹ , -NH-COR ¹⁰ , -COOH, -COOR ¹⁰ , -CONH ₂ , -CONHR ¹⁰ , -CONR ⁰ R ¹¹ , -CO-H, -COR ¹⁰ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue;

Ra at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ -e-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁰ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁰ , -NR ⁰ R ¹¹ , -NH-COR ¹⁰ ,

-COOH, -COOR ¹⁰ , -CONH ₂ , -CONHR ¹⁰ , -CONR ⁰ R ¹¹ , -CO-H, -COR ¹⁰ , Ci-10-alkyl, C2-io-alkenyl, C2-io-alkynyl, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; wherein R ¹⁰ and R ^{1 1} at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C2-io-alkenyl, C2-io-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue,

G ¹ and G ² are independently from each other

wherein

R ⁵ and R ⁶ are independently from each other H or Ci

L is C6-24-arylene optionally substituted with 1 to 6 substituents R ^b or bivalent 5 to 24 membered aromatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^b , wherein

R ^b at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN , -N0 ₂ , -OH , Ci- ₃₀ -alkoxy,

-0-CH ₂ CH ₂ 0-Ci-3o-alkyl, -O-COR ¹² , -S-Ci _-3 o-alkyl, -N H ₂ , -N H R ¹² , -N R ¹² R ¹³ , -N H-COR ¹² , -COOH , -COOR ¹² , -CON H2, -CON H R ² , -CON R ² R ¹³ , -CO-H , -COR ¹² , Ci-30-alkyl optionally substituted with 1 to 6 substituents R ^h , C2-3o-alkenyl optionally substituted with 1 to 6 substituents R ^h , C2-3o-alkynyl optionally substituted with 1 to 6 substituents R ^h , C3-io-cyclo- alkyl optionally substituted with 1 to 6 substituents R', Cs-io-cycloalkenyl optionally substituted with 1 to 6 substituents R' and monovalent 3 to 14 membered aliphatic heterocyclic residue optionally substituted with 1 to 6 substituents R', wherein

R ¹² and R ¹³ at each occurrence are independently from each other selected from the group consisting of Ci-30-alkyl, C2-3o-alkenyl, C2-3o-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue, R ^h at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -NO2, -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁴ , -S-Ci-io-alkyl, -NH ₂ , -NHR ¹⁴ , -NR ¹⁴ R ¹⁵ , -NH-COR ¹⁴ , -COOH, -COOR ¹⁴ , -CONH2, -CONHR ⁴ , -CONR R ¹⁵ , -CO-H, -COR ¹⁴ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue;

R' at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁴ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁴ , -NR R ¹⁵ , -NH-COR ¹⁴ , -COOH, -COOR ¹⁴ , -CONH ₂ , -CONHR ¹⁴ , -CONR R ¹⁵ , -CO-H, -COR ¹⁴ , Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; wherein R ¹⁴ and R ¹⁵ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue,

wherein

R ¹⁶ and R ¹⁷ are independently from each other H, Ci-30-alkyl, -CN or halogen,

q and s are independently from each other 0, 1 , 2, 3, 4 or 5, r is 0, 1 or 2, and n is an integer from 2 to 10Ό00. In more preferred units of formula (1 )

R ¹ and R ² are independently from each other Ci-30-alkyl optionally substituted with 1 to 6 substituents R ^c , preferably Ci -alkyl optionally substituted with 1 to 6 substituents R ^c , more preferably Ci-12-alkyl optionally substituted with 1 to 6 substituents R ^c , wherein

R ^c at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy,

-0-CH ₂ CH ₂ 0-Ci-io-alkyl, -0-COR ³ , -S-Ci-10-alkyl, -NH ₂ , -NHR ³ , -NR ³ R ⁴ , -NH-COR ³ , -COOH, -COOR ³ , -CONH ₂ , -CONHR ³ , -CONR ³ R ⁴ , -CO-H, -COR ³ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; wherein R ³ and R ⁴ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, -io-cycloalkyl, -io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue,

-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue,

G ¹ and G ² are independently from each other -i4-arylene optionally substituted with 1 to 6 substituents R ^a or bivalent 5 to 14 membered aromatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^a , wherein

R ^a at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci- ₃₀ -alkoxy,

-0-CH ₂ CH ₂ 0-Ci-3o-alkyl, -O-COR ⁸ , -S-Ci _-3 o-alkyl, -NH ₂ , -NHR ⁸ , -NR ⁸ R ⁹ , -NH-COR ⁸ , -COOH, -COOR ⁸ , -CONH ₂ , -CONHR ⁸ , -CONR ⁸ R ⁹ , -CO-H, -COR ⁸ , Ci-so-alkyl optionally substituted with 1 to 6 substituents R ^f , C _2- 3o-alkenyl optionally substituted with 1 to 6 substituents R ^f , C _2- 3o-alkynyl optionally substituted with 1 to 6 substituents R ^f , -io-cycloalkyl optionally substituted with 1 to 6 substituents Rs, Cs-io-cycloalkenyl optionally substituted with 1 to 6 substituents Rs and monovalent 3 to 14 membered aliphatic heterocyclic residue optionally substituted with 1 to 6 substituents Rs, wherein

R ⁸ and R ⁹ at each occurrence are independently from each other selected from the group consisting of Ci-30-alkyl, C _2- 3o-alkenyl, C _2- 3o-alkynyl, -io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue, R ^f at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁰ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁰ , -NR ¹⁰ R ¹¹ , -NH-COR ¹⁰ -COOH, -COOR ¹⁰ , -CONH ₂ , -CONHR ¹⁰ , -CONR ⁰ R ¹¹ , -CO-H, -COR ¹⁰ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue;

R9 at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁰ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁰ , -NR ⁰ R ¹¹ , -NH-COR ¹⁰ -COOH, -COOR ¹⁰ , -CONH ₂ , -CONHR ¹⁰ , -CONR ⁰ R ¹¹ , -CO-H, -COR ¹⁰ , Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; wherein R ¹⁰ and R ¹¹ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, C3-10- cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue,

G ¹ and G ² are independently from each other

wherein

R ⁵ and R ⁶ are independently from each other H or Ci-30-alkyl,

L is C6- ₂ 4-arylene optionally substituted with 1 to 6 substituents R ^b or bivalent 5 to 24 membered aromatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^b , wherein

R ^b at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-30-alkoxy,

-0-CH ₂ CH ₂ 0-Ci-3o-alkyl, -O-COR ¹² , -S-Ci-30-alkyl, -NH ₂ , -NHR ¹² , -NR ² R ¹³ , -NH-COR ¹² , -COOH, -COOR ¹² , -CONH ₂ , -CONHR ¹² , -CONR ² R ¹³ , -CO-H, -COR ¹² , Ci-30-alkyl optionally substituted with 1 to 6 substituents R ^h , C _2- 3o-alkenyl optionally substituted with 1 to 6 substituents R ^h , C _2- 3o-alkynyl optionally substituted with 1 to 6 substituents R ^h , C3-io-cyclo- alkyl optionally substituted with 1 to 6 substituents R', Cs-io-cycloalkenyl optionally substituted with 1 to 6 substituents R' and monovalent 3 to 14 membered aliphatic heterocyclic residue optionally substituted with 1 to 6 substituents R', wherein

R ¹² and R ¹³ at each occurrence are independently from each other selected from the group consisting of Ci-30-alkyl, C2-3o-alkenyl, C2-3o-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue,

R ^h at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ -e-alkylene-0-, halogen, -CN, -NO2, -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -0-COR ¹⁴ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁴ , -NR ¹⁴ R ¹⁵ , -NH-COR ¹⁴ -COOH, -COOR ¹⁴ , -CONH2, -CONHR ⁴ , -CONR R ¹⁵ , -CO-H, -COR ¹⁴ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue;

R' at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -0-COR ¹⁴ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁴ , -NR ⁴ R ¹⁵ , -NH-COR ¹⁴ -COOH, -COOR ¹⁴ , -CONH ₂ , -CONHR ¹⁴ , -CONR R ¹⁵ , -CO-H, -COR ¹⁴ , Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, -i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; wherein R ¹⁴ and R ¹⁵ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl,

C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue,

wherein

R ¹⁶ and R ¹⁷ are independently from each other H, Ci-30-alkyl, -CN or halogen, q and s are independently from each other 0, 1 , 2, 3, 4 or 5, r is 0, 1 or 2, and n is an integer from 2 to 10Ό00.

In even more preferred units of formula (1 )

R ¹ and R ² are independently from each other Ci-30-alkyl optionally substituted with 1 to 6 sub- stituents R ^c , preferably Ci-16-alkyl optionally substituted with 1 to 6 substituents R ^c , more preferably Ci-12-alkyl optionally substituted with 1 to 6 substituents R ^c , wherein

R ^c at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy,

-0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ³ , -S-Ci-10-alkyl, -NH ₂ , -NHR ³ , -NR ³ R ⁴ , -NH-COR ³ , -COOH, -COOR ³ , -CONH ₂ , -CONHR ³ , -CONR ³ R ⁴ , -CO-H, -COR ³ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; wherein R ³ and R ⁴ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, C3-io-cycloalkyl, C5-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue,

G ¹ and G ² are independently from each other bivalent 5 to 14 membered aromatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^a , wherein

R ^a at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci- ₃₀ -alkoxy,

-0-CH ₂ CH ₂ 0-Ci-3o-alkyl, -O-COR ⁸ , -S-Ci _-3 o-alkyl, -NH ₂ , -NHR ⁸ , -NR ⁸ R ⁹ , -NH-COR ⁸ , -COOH, -COOR ⁸ , -CONH ₂ , -CONHR ⁸ , -CONR ⁸ R ⁹ , -CO-H, -COR ⁸ , Ci-so-alkyl optionally substituted with 1 to 6 substituents R ^f , C _2- 3o-alkenyl optionally substituted with 1 to 6 sub- stituents R ^f , C _2- 3o-alkynyl optionally substituted with 1 to 6 substituents R ^f , C3-io-cycloalkyl optionally substituted with 1 to 6 substituents Rs, Cs-io-cycloalkenyl optionally substituted with 1 to 6 substituents Rs and monovalent 3 to 14 membered aliphatic heterocyclic residue optionally substituted with 1 to 6 substituents Rs, wherein

R ⁸ and R ⁹ at each occurrence are independently from each other selected from the group consisting of Ci-30-alkyl, C2-3o-alkenyl, C2-3o-alkynyl, C3-io-cycloalkyl, Cs-io-cyclo- alkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue, R ^f at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁰ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁰ , -NR ¹⁰ R ¹¹ , -NH-COR ¹⁰ , -COOH, -COOR ¹⁰ , -CONH ₂ , -CONHR ¹⁰ , -CONR ⁰ R ¹¹ , -CO-H, -COR ¹⁰ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monova- lent 5 to 14 membered aromatic heterocyclic residue; at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁰ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁰ , -NR ⁰ R ¹¹ , -NH-COR ¹⁰ , -COOH, -COOR ¹⁰ , -CONH ₂ , -CONHR ¹⁰ , -CONR ⁰ R ¹¹ , -CO-H, -COR ¹⁰ , Ci-10-alkyl,

C _2- io-alkenyl, C _2- io-alkynyl, -i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; wherein R ¹⁰ and R ¹¹ at each occurrence are independently from each other se- lected from the group consisting of Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl,

-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue, or

G ¹ and G ² are independently from each other

wherein

R ⁵ and R ⁶ are independently from each other H or Ci-30-alkyl, L is bivalent 5 to 24 membered aromatic heterocyclic residue optionally substituted with 1 to 6 substituents R ^b , wherein

R ^b at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci- ₃₀ -alkoxy,

-0-CH ₂ CH ₂ 0-Ci-3o-alkyl, -O-COR ¹² , -S-Ci _-3 o-alkyl, -NH ₂ , -NHR ¹² , -NR ¹² R ¹³ , -NH-COR ¹² , -COOH, -COOR ¹² , -CONH ₂ , -CONHR ² , -CONR ² R ¹³ , -CO-H, -COR ¹² , Ci-so-alkyl optionally substituted with 1 to 6 substituents R ^h , C _2- 3o-alkenyl optionally substituted with 1 to 6 substituents R ^h , C _2- 3o-alkynyl optionally substituted with 1 to 6 substituents R ^h , C3-io-cyclo- alkyl optionally substituted with 1 to 6 substituents R', Cs-io-cycloalkenyl optionally substituted with 1 to 6 substituents R' and monovalent 3 to 14 membered aliphatic heterocyclic residue optionally substituted with 1 to 6 substituents R', wherein

R ¹² and R ¹³ at each occurrence are independently from each other selected from the group consisting of Ci-30-alkyl, C _2- 3o-alkenyl, C _2- 3o-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue,

R ^h at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁴ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁴ , -NR R ¹⁵ , -NH-COR ¹⁴ , -COOH, -COOR ¹⁴ , -CONH ₂ , -CONHR ¹⁴ , -CONR R ¹⁵ , -CO-H, -COR ¹⁴ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, -i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue;

R' at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C _2- 6-alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁴ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁴ , -NR R ¹⁵ , -NH-COR ¹⁴ ,

-COOH, -COOR ¹⁴ , -CONH ₂ , -CONHR ¹⁴ , -CONR R ¹⁵ , -CO-H, -COR ¹⁴ , Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, -i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue; wherein R ¹⁴ and R ¹⁵ at each occurrence are independently from each other selected from the group consisting of Ci-10-alkyl, C _2- io-alkenyl, C _2- io-alkynyl, C3-io-cycloalkyl, Cs-io-cycloalkenyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to14 membered aromatic heterocyclic residue,

or

wherein

R ¹⁶ and R ¹⁷ are independently from each other H, Ci-30-alkyl, -CN or halogen,

q and s are independently from each other 0, 1 , 2, 3, 4 or 5, r is 0, 1 or 2, and n is an integer from 2 to 10Ό00.

In most preferred units of formula (1 )

R ¹ and R ² are independently from each other Ci-16-alkyl, more preferably Ci-12-alkyl,

G ¹ and G ² are independently from each other monocyclic bivalent 5 to 8 membered aromatic heterocyclic residue optionally substituted with 1 to 4 substituents R ^a , wherein

R ^a at each occurrence are independently from each other Ci-30-alkyl optionally substituted with 1 to 4 substituents R ^f , wherein

R ^f at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy,

-0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁰ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁰ , -NR ¹⁰ R ¹¹ , -NH-COR ¹⁰ , -COOH, -COOR ¹⁰ , -CONH ₂ , -CONHR ¹⁰ , -CONR ⁰ R ¹¹ , -CO-H, -COR ¹⁰ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent

5 to 14 membered aromatic heterocyclic residue; L is bivalent 5 to 14 membered aromatic heterocyclic residue optionally substituted with 1 to 4 substituents R ^b , wherein

R ^b at each occurrence are independently from each other Ci-30-alkyl optionally substituted with 1 to 4 substituents R ^h , wherein

R ^h at each occurrence are independently from each other selected from the group consisting of =0, =C(CN) ₂ , -0-C ₂ - ₆ -alkylene-0-, halogen, -CN, -N0 ₂ , -OH, Ci-10-alkoxy, -0-CH ₂ CH ₂ 0-Ci-io-alkyl, -O-COR ¹⁴ , -S-Ci-10-alkyl, -NH ₂ , -NHR ¹⁴ , -NR ¹⁴ R ¹⁵ , -NH-COR ¹⁴ , -COOH, -COOR ¹⁴ , -CONH ₂ , -CONHR ⁴ , -CONR R ¹⁵ , -CO-H, -COR ¹⁴ , C ₃ -io-cycloalkyl, monovalent 3 to 14 membered aliphatic heterocyclic residue, C6-i4-aryl and monovalent 5 to 14 membered aromatic heterocyclic residue;

q and s are independently from each other 1 , 2 or 3, r is 1 or 2, and n is an integer from 5 to 10Ό00.

In even most preferred units of formula (1 )

R ¹ and R ² are independently from each other Ci-16-alkyl, more preferably Ci-i ₂ -alkyl, G ¹ and G ² are independently from each other monocyclic bivalent 5 to 8 membered aromatic heterocyclic residue, wherein G ¹ and G ² are substituted with 1 to 2 substituents R ^a , wherein

R ^a at each occurrence are independently from each other C6- ₂ o-alkyl,

L is bivalent 5 to 14 membered aromatic heterocyclic residue, wherein L is substituted with 1 to 2 substituents R ^b , wherein

R ^b at each occurrence are independently from each other C6- ₂ o-alkyl, q and s are both 1 , r is 1 , and n is an integer from 5 to 10Ό00.

Particular preferred units of formula (1 ) are units of formula

wherein R ¹ , R ² , R ^a , L and n are as defined above.

In particular preferred units of formula (1a)

L is

wherein R ^b is as defined above.

Preferably, n is an integer from 5 to 5Ό00, more preferably from 5 to 1 Ό00, even more preferably from 5 to 100, and most preferably from 10 to 100. A particular preferred example of the units of formulae (1 ) and (1a) is the unit of formula

The semiconducting material of the present invention can be a polymer comprising preferably at least 80% by weight, more preferably at least 90% by weight, of a unit of formula (1 ), respectively, (1a) based on the weight of the polymer.

Most preferably, the semiconducting material of the present invention is a polymer consisting essentially of a unit of formula (1 ), respectively, (1a).

The polymer comprising a unit of formula (1 ) can be prepared by treating a compound of formula

wherein R ¹ , R ² , G ¹ , G ² , q and s are as defined above, and Hal ¹ is halogen, preferably -Br, with a compound of formula

(3)

wherein L and q are as defined above, and R ¹⁰⁰ , R ¹⁰¹ and R ¹⁰² are independently from each other Ci-io-alkyl, preferably methyl. in the presence of transition metal catalyst 1 .

Transition metal catalyst 1 is preferably a palladium catalyst such tris(dibenzylideneacetone)- dipalladium(O), preferably in combination with a phosphine such as tri-otolylphosphine. The reaction is preferably performed at elevated temperatures such 80 to 200 °C, preferably 90 to 150 °C. The reaction can be performed in an inert organic solvent such as chlorobenzene. The reaction can be stopped by the addition of end cappers such as 2-bromothiophene and 2-thiophene boronic acid. The crude product may be worked up by conventional methods, for example by extracting the crude product with an appropriate solvent, for example with acetone.

The compound of formula (2) can be prepared by treating a compound of formula

wherein R ¹ , R ² , G ¹ , G ² , q and s are as defined above, with a halogenating agent.

The halogenating agent is preferably /V-bromosuccinimide. The reaction is preferably performed at ambient temperatures such -5 to 50 °C, preferably 0 to 30 °C. The reaction can be performed in an organic solvent such chloroform. The crude product may be worked up by conventional methods, for example by column chromatography.

The compound of formula (4) can be prepared by reacting a compound of formula

wherein R ¹ and R ² are as defined above, with compounds of formulae

(6) wherein G ¹ , G ² , q and s are as defined above, and R ²⁰⁰ , R ²⁰¹ and R ²⁰² are independently from each other Ci-10-alkyl, preferably methyl in the presence of a transition metal catalyst 2.

Transition metal catalyst 2 is preferably a palladium catalyst such tetrakis(triphenylphosphine) palladium(O). The reaction is preferably performed at elevated temperatures such 80 to 200 °C, preferably 90 to 150 °C. The reaction can be performed in an inert organic solvent such as di- methylformamide. The crude product may be worked up by conventional methods, for example by column chromatography. The compound of formula (5) can be prepared by treating a compound of formula

wherein R ¹ and R ² are as defined above, with a halogenating agent.

The halogenating agent is preferably Br2. The reaction is preferably performed at ambient temperatures such -5 to 30 °C, preferably 0 to 30 °C. The reaction can be performed in an organic solvent such dichloromethane. The crude product may be worked up by conventional methods.

The compound of formula (8) can be prepared according to following reaction scheme:

(12) (11)

The compounds of formulae (2), (4) and (5) are also part of the invention.

Also part of the present invention is an electronic device comprising the polymer comprising a unit of formula (1 ) as semiconducting material. Preferably, the electronic device is an organic field effect transistor (OFET), and in particular a thin film transistor (TFT). Preferably, the elec- tronic device is an organic photovoltaic device (OPV).

Usually, an organic field effect transistor comprises a dielectric layer, a semiconducting layer and a substrate. In addition, on organic field effect transistor usually comprises a gate electrode and source/drain electrodes.

An organic field effect transistor can have various designs.

The most common design of a field-effect transistor is the Bottom-Gate Top-Contact (BGTC) design. Here, the gate is on top of the substrate and at the bottom of the dielectric layer, the semiconducting layer is at the top of the dielectric layer and the source/drain electrodes are on top of the semiconducting layer.

Another design of a field-effect transistor is the Top-Gate Bottom-Contact (TGBC) design. Here, the source/drain electrodes are on top of the substrate and at the bottom of the semiconducting layer, the dielectric layer is on top of the semiconducting layer and the gate electrode is on top of the dielectric layer. The semiconducting layer comprises the semiconducting material of the present invention. The semiconducting layer can have a thickness of 5 to 500 nm, preferably of 10 to 100 nm, more preferably of 20 to 50 nm. The dielectric layer comprises a dielectric material. The dielectric material can be silici- um/silicium dioxide, or, preferably, an organic polymer such as polystyrene (PS), polymethylmethacrylate) (PMMA), poly(4-vinylphenol) (PVP), polyvinyl alcohol) (PVA), anzocyclobutene (BCB), or polyimide (PI). The dielectric layer can have a thickness of 10 to 2000 nm, preferably of 50 to 1000 nm, more preferably of 100 to 800 nm.

The source/drain contacts and the gate contact can be made from any suitable material, for example Au.

The substrate can be any suitable substrate such as glass, or a plastic substrate. Preferably the substrate is a plastic substrate such as polyethersulfone, polycarbonate, polysulfone, polyethylene terephthalate (PET) and polyethylene naphthalate (PEN). More preferably, the plastic substrate is a plastic foil.

The organic field effect transistor can be prepared by methods known in the art.

For example, a top-gate bottom-contact (TGBC) thin film transistors (TFTs) can be prepared as follows: first: the source/drain contacts are placed on the substrate, for example by thermal evaporation of the source/drain material; second: the substrate is coated with the semiconduct- ing layer, for example by spin-coating a solution of the semiconducting material in a suitable solvent and drying the semiconducting layer at elevated temperatures, for example at 80 to 100 °C; third: the semiconducting layer is coated with a solution of the dielectric material in a suitable solvent, for example by spin-coating a solution of the dielectric material and drying the dielectric layer at elevated temperatures, for example at 80 to 100 °C; fourth: the gate contact is placed on top of the dielectric layer, for example by thermal evaporation of the gate material.

Also part of the present invention is the use of the polymer comprising the unit of formula (1 ) as semiconducting material.

Electronic devices comprising the semiconducting materials of the present invention show high charge carrier mobility as well as high stability, in particular towards oxidation by air, under ambient environmental conditions. In addition, the semiconducting materials of the present invention are compatible with liquid processing techniques such as spin coating and thus allow the production of low cost, light weight and flexible electronic devices.

Examples

Example 1

Preparation of polymer P1 essentially consisting of units of formula (1 b) The polymer P1 essentially consisting of units of formula (1 b) is prepared according to the following reaction scheme:

(2a) (1b) Preparation of the compound of formula (1 1a)

Methyl iodide (10.9 g, 76.8 mmol) is added to a solution of 1 ,5-naphthyridine (12) (5 g, 38.4 mmol) in MeOH (30 mL) and the reaction mixture is heated at 40 °C over 3 days under N2. The precipitate is filtered and dried under high vacuum to afford compound 1 1a as yellowish green solid (8.51 g, 81 .1 %). ¹ H NMR (400 MHz, CDCI ₃ , r.t) δ 9.49 (d, 1 H), 9.38 (dd, 1 H), 9.26 (d, 1 H), 8.98 (dd, 1 H), 4.75 (s, 3H).

Preparation of the compound of formula (10a)

NaOH solution (5.6 g, 140.2 mmol, in 30 mL H ₂ 0) and K ₃ Fe(CN) ₆ solution (21 .6 g, 65.5 mmol, in 30 mL H2O) are added concurrently over 30 min to a solution of napthyridine methiodide (1 1a) (8.5 g, 31 .2 mmol) in H2O (80 mL) at -10 °C. The reaction mixture is allowed to warm to RT overnight. Excess NaCI is added and the reaction mixture is then extracted with CHC (150 mL x 3). The combined organic phases are dried over Na2S0 ₄ , filtered and concentrated in vacuo. The crude product is purified by flash column using MeOH+1 % TEA on silica gel to afford compound 10a as violet solid (3.07 g, 61.4 %). ¹ H NMR (400 MHz, CD ₃ OD, r.t) δ 12.49 (d, 1 H), 12.00 (d, 1 H), 1 1.91 (d, 1 H), 1 1.59 (dd, 1 H), 10.88 (d, 1 H), 8.79 (s, 3H).

Preparation of the compound of formula (9a)

Mel (3.58 mL, 57.5 mmol) is added to a solution of compound 10a (3.07 g, 19.2 mmol) in toluene (50 mL) and the reaction mixture is allowed to stir at 1 15°C for 2 days. The reaction mixture is filtered and dried in vacuo to afford compound 9a as green solid (4.75 g, 81 .8 %). ¹ H NMR (400 MHz, CD3OD, r.t) δ 8.95 (d, 1 H), 8.79 (d, 1 H), 8.50 (dd, 1 H), 8.19 (dd, 1 H), 7.34 (d, 1 H), 4.63 (s, 3H), 3.87 (s, 3H).

Preparation of the compound of formula (8a)

NaOH solution (4.39 g, 109.7 mmol, in 15 mL H ₂ 0) and K ₃ Fe(CN) ₆ solution (15.51 g,

47.1 mmol, in 50 mL of water ) are added concurrently over 30 min to a solution of methyl- napthyridine methiodide 9a (4.75 g, 15.7 mmol) in H2O (25 mL) at 0 °C. The reaction mixture is allowed to stir at 0 °C for 30 min and is then allowed to warm to RT overnight. Excess NaCI is added followed by extraction with CHCb (100 mL x 3). The combined organic phases are dried over Na2S0 ₄ and concentrated in vacuo. Recrystallization in MeOH/Acetone mixture afforded compound 8a as orange brown crystals (1 .52 g, 51 .1 %). ¹ H NMR (400 MHz, CD ₃ OD, r.t) δ 8.04 (d, 2H), 6.92 (d, 2H), 4.87 (s, 3 H), 3.80 (s, 3H).

Preparation of the compound of formula (5a)

1 ,5-dimethylnapthyridine-dione 8a (1 .35 g, 7.08 mmol), NaHCOs (2.38 g, 28.3 mmol) and bromine (2.83 g, 17.1 mmol) are dissolved in dichloromethane/H20 mixture (1 :1 , 200 mL) at 0 °C and allowed to warm to RT overnight. The reaction mixture is filtered and washed with MeOH. Saturated sodium thiosulfate (aq) is added to the filtrate and the aqueous phase is extracted with dichloromethane (200 mL x 3). The combined organic phases are dried over Na2S0 ₄ and concentrated in vacuo. The combined solids are dispersed in methanol, subjected to 3 cycles of sonication, followed by centrifugation and decantation to yield yellow compound 5a (2.18 g, 88.5 %). H NMR (400 MHz, DMSO, r.t) δ 8.36 (s, 2H), 3.72 (s, 6H).

Preparation of the compound of formula (4a)

Pd(PPh ₃ )4 (0.1 1 g, 0.10 mmol) is added to a solution of compound 5a (0.68 g, 1.97 mmol) and compounds 6a (2.45 g, 5.90 mmol) in degassed dimethylformamide (23 ml_). The reaction mixture is heated to 130 °C and stirred overnight. The reaction mixture is allowed to cool to RT, washed with H2O (25 ml_), extracted with CH2CI2 (25 ml. x 3), dried over Na2S0 ₄ and concentrated. The residue is purified by flash column (0→ 100% ethyl acetate/hexane) to afford com- pound 4a as red solid (0.42 g, 31 %). ¹ H NMR (400 MHz, CDCI ₃ , r.t) δ 7.71 (s, 2H), 7.42 (d, 2H), 7.04 (d, 2H), 3.82 (s, 6H), 2.73 (t, 4H), 1 .67 - 1 .48 (m, 35H), 0.87 - 0.85 (m, 1 1 H).

Preparation of the compound of formula (2a)

/V-bromosuccinimide (0.17 g, 0.97 mmol) is added to a solution of compound 4a (0.32 g, 0.46 mmol) in CHCI3 (32 ml.) at 0 °C. The temperature of the reaction mixture is allowed to slowly rise to RT and the reaction mixture is stirred overnight. The reaction mixture is quenched with H2O (50 ml_), extracted with CHCI3 (50 ml. x 3), washed with brine, dried over Na?S0 ₄ and concentrated. Crude compound 2a is purified by flash column (0→ 50% ethyl acetate/hexane) to afford compound 2a as red solid (0.46 g, 88%). ¹ H NMR (400 MHz, CDCI ₃ , r.t) δ 7.68 (s, 2H), 6.98 (s, 2H), 3.80 (s, 6H), 2.69 (t, 4H), 1 .68 - 1 .56 (m, 35H), 0.88 - 0.84 (m, 1 1 H).

Preparation of polymer P1 essentially consisting of units of formula (1 b)

Compound 2a (100 mg, 0.12 mmol), compound 3a (1 12 mg, 0.12 mmol), Pd2dba3 (5.4 mg, 0.006 mmol) and P(o-tolyl)3 (3.6 mg, 0.01 mmol) are added to a Schlenk tube and degassed 3 times with nitrogen. Chlorobenzene (3 ml.) is then added and the reaction mixture is heated under N2 at 130 °C. After 2 days, 1 drop of 2-bromothiophene is added and the reaction mixture is allowed to stir for 1 h. 1 drop of 2-(tributylstannyl)thiophene is added and the reaction mixture is allowed to stir at 130 °C overnight. The reaction mixture is poured slowly into 500 ml. of MeOH. The mixture is stirred for 2 h. The precipitate obtained is filtered and subjected to Sox- hlet extraction with acetone overnight. The filtrate is dried under vacuo, dissolved in minimum amount of hot chlorobenzene and precipitated again by pouring it into beaker with methanol. The mixture is stirred for 1 h, filtered and the filtrate is dried under vacuum overnight to afforded polymer P1 as red solid (36 mg, 23 %). ¹ H NMR (400 MHz, DCE, r.t) δ 7.72 (brs, 2 H), 7.22 - 7.12 (m, 4H), 3.83 (brs, 6 H), 2.80 (brs, 4H), 1.79 - 0.85 (m, 1 12H). Mn: 1 .24 x 10 ⁴ , PDI: 2.53. Example 2

Preparation of top-gate bottom-contact transistors (TGBC) containing the polymer P1 , essentially consisting of the units of formula 1 b, as semiconducting material A top-gate bottom-contact (TGBC) thin film transistor (TFT) is fabricated on glass (PGO glass used as received). Au source-drain contacts (30 nm-thick) are thermally-evaporated. The substrate is then coated with the semiconductor layer (thickness: 40 to 50 nm) by spin-coating (1000 rpm) a solution of polymer P1 (prepared as described in example 1 ) in dichloromethane (concentration ~ 10 mg/mL), and drying the film at 90 °C for 30 seconds. A 4 weight% polysty- rene solution in isopropyl acetate is spin-coated (3600 rpm) and the dielectric film formed is dried at 90 °C for 30 seconds to yield a dielectric layer (thickness: 500 to 600 nm). The device structure is completed by vapor deposition of patterned Au gate contacts (-30 nm thick) through a shadow mask. Channel lengths and widths are 50 μηη and 0.5 mm, respectively, to afford W/L = 10.

The top-gate, bottom-contact (TGBC) thin film transistors of example 2 show the following mobility: 4 x 10- ³ cm ² V- ¹ s- ¹ .