发色团含有乙撑基或乙烯撑桥基的碳菁合成及其光谱和增感性能

Carbocyanines with the Ethylene and Vinylene Bridge Groups in the Chromophore.Synthesis,spectral and sensitizing properties.

本文研究发色团α,α′ 位上具有乙撑基和乙烯撑桥基的碳菁合成通法 ,染料的立体结构、质子化倾向和萤光特性。探讨了多甲川发色团的α,α′ 位桥基和中位取代基对硫碳菁在长波区域的电子吸收光谱的影响。研究结果指出 :多甲川链上含有乙撑桥的硫碳菁有可能使照相卤化银乳剂在远红区和近红外光谱区产生高效的光谱增感作用。

A general synthetic access to carbocyanines with the ethylene and vinylene bridge groups in the chromophore has been elaborated.Sterical structure,protonation position,and fluorescence features have been studied for these dyes.Consideration includes the effect of α,α′ bridge groups and meso substituents in the polymethine chromophore on the longwavelength band positions in the electronic absorption spectra of the thiacarbocyanines.As shown,thiacarbocyanines with the ethylene bridge in the polymethine chain enable an efficient spectral sensitization of silver halide photographic emulsions in the far red and near infrared spectral regions.