9-ALKYLCARBOCYANINES WITH 5,6-DIOXYMETHYLENEBENZTHAZOLE RESIDUE AS SPECTRAL SENSITIZERS FOR PHOTOGRAPHIC SILVER HALIDE EMULSIONS AND A METHOD FOR SPECTRAL SENSITIZATION UTILIZING THESE SENSITIZERS

摘要

FIELD: light-sensitive materials. SUBSTANCE: invention provides 9-alkylcarbocyanines with 5,6- dioxymethylenebenzthazole residue depicted by formula I: (I), in which A represents lower alkyl; B 5,6-methylenedioxy, 4,5-benzo, alkyl, alkoxy, or halogen; [K]⁺ trimethyl ammonium, pyridinium, 1,1'-diethylqyino-2,2'- monomethincyanine, or 3,3-diethylthiazolinecarbocyanine; to the exclusion of compounds I wherein A is ethyl, [K]⁺ trimethyl ammonium, and B 5,6- methylenedioxy group, as spectral sensitizers for photographic silver halide emulsions. Method for spectral sensitization of these emulsions utilizing proposed sensitizers allows one to obtain almost always sufficiently high or higher level of general and additional light sensitivities of photographic layer in visible spectrum region. EFFECT: enhanced sensitivity of emulsion layers. 2 cl, 4 tbl, 42 ex