| 摘要 |
Phenanthroazole cyanines and anthraazole cyanines, having not less than one acidic group, of the formula I are excellent spectral sensitizers. <IMAGE> (I) The symbols in formula I have the following meanings X1 and X2 O, S, Se or NR10; R1 and R2 or R2 and R3 residues of an optionally substituted phenanthroazole or anthraazole with the remaining group R3 or R1 signifying hydrogen; R4 and R6 hydrogen or together a pi -bond, R5 and R7 hydrogen, alkyl or aryl or R4,R5,R6 and R7 residues of an optionally substituted benzazole, naphthazole, phenanthroazole or anthraazole; R8, R9 alkyl, sulphoalkyl, carboxyalkyl, -(CH2)m-CO-NR11-SO2-R12 or -(CH2)m-SO2-NR11-CO-R12; R10 a residue as defined for R8/R9 or aryl; R11 hydrogen or the negative charge ((-)) which remains when a proton is removed; R12 alkyl, aryl, -O(-), -N(R13)2; R13 hydrogen, alkyl or aryl (the same or different); R hydrogen, C1-C4-alkyl, C1-C4-alkylthio or phenyl; m an integer from 1 to 10; n 0 or 1; and M+ a cation optionally required to neutralize the charge, with the proviso that the cyanine dye having the formula I possesses not less than one group, selected from the group consisting of a sulphoalkyl group, a carboxyalkyl group, a group -(CH2)m-CO-NR11-SO2-R12 and a group -(CH2)m-SO2-NR11-CO-R12.
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