CYANINE DYES FOR SENSITIZING SILVER HALIDE EMULSIONS TO INFRARED RADIATION AND PHOTOGRAPHIC ELEMENTS INCLUDING THEM

摘要

Cyanine Dyes For Sensitizing Silver Halide Emulsions To Infrared Radiation And Photographic Elements Including Them Cyanine dyes including two nitrogen containing heterocyclic nuclei, linked to each other through a rigidized conjugated 7, 9 or 11 carbon atom methine chain to form an amidinium-ion resonance system, are very good for sensitizing silver halide emulsions for use in photographic elements to be exposed to infrared radiation if one of said heterocyclic nuclei is 5-methyl-6-methoxy-benzothiazole.