NEW MATERIAL:A compound in which 1 or 2 molecules of a naphthalene derivative expressed by formula II (Y and Z represent O or NH) are added to a tetraazaporphyrin compound expressed by formula I [M represents group Ia, IIa and IIIa atom of the periodic table or transition metal; R1 and R2 represent H, F, Cl, Br, nitro, (halogen-substituted) alkyl, aryl, aralkyl or OA (A represents H, alkyl, aryl, aralkyl or polyether); m and n are 1-4].
EXAMPLE: Tetra-1-phenyltetranaphthotetrazaporphyrinato copper complex-(1- phenyl-2,3-naphthalene-dicarboximide) (1/1).
USE: An optical recording material having a characteristic light absorbance within a near infrared region of 750-850nm, which is soluble in variable solvents and stable to heat and light.
PREPARATION: A mixture of a naphthalene derivative expressed by formula II with urea is subjected to cyclization reaction together with a metal (chloride), etc., in the presence of a catalytic amount of ammonium molybdate.
YOKOTA KEIKO
IBATA KATSUHIRO
KASHIMA TOSHIHIRO
UHARA HISASHI
TOYO BOSEKI