感绿增感染料超增感组合研究

Study on Supersensitizing Combination of Some Green Sensitive Dyes

采用感绿的对称恶碳菁、咪碳菁染料、不对称的恶咪碳菁染料及(?)-2′-菁(SO-Ⅰ)、2,2′-菁(SQ-Ⅱ)中位甲基取代硒碳菁(SM-Ⅲ)染料,通过电子自旋共振(ESR)技术、染料的极谱分析及其在乳剂中的应用性能等进行超增感组合研究。结果表明:超增感作用与ESR信号,极谱半波电位之间有一定关系,当增感染料最高占有能级接近溴碘化银价带頂部能级时,无ESR信号。超增感剂的氧化电位值小于0.88V,并比增感染料氧化电位值低才出现ESR信号。其超增感作用的产生可用正穴捕获超增感机理加以阐明。

The optical sensitizations of some green sensitizers, such as oxacarbocyanine, benzimidazolo-carbocyanine, benzimidazolo-oxacarbocyanine, thia-2'-cyanine (SO-Ⅰ), 2,2'-cyanine (SQ-Ⅱ), and meso-position methyl replaced seleno-carbocyanine (SM-Ⅲ)dyes, are studied.Electron spin resonance (ESR) and pohrographic measurement of dyes and photogrophic emulsion tests show that efficiency of the supersensitizing combination is connected with ESR signal and pohrographic half-wave potential. When the highest occupied energy level of the sensitizer is slightly above the top of valence band of silver bromo-iodide no ESR signal is found to exist. When the oxidation electron potential of supersensitizer is below 0.88 V, that is, lower than the oxidation electron potential of the sensitizer, the ESR signal usually occurs. The function of supersensitization can be explained by its hole tapping mechanism.