A process for the preparation of photographic binary sensitizing dyes, which comprise two separate, nonconjugated chromophores, one of which has the capability of adsorbing to a silver halide grain surface, the other of which is substantially non-adsorbing to silver halide. The process comprises reacting two dye compounds in a solvent in the presence of a 2-halo-1-alkylpyridinium salt and a 4-dialkylaminopyridine.
一种制备照相二元感光
染料的工艺,该
染料由两个独立的非共轭发色团组成,其中一个发色团具有吸附卤化
银颗粒表面的能力,而另一个发色团基本上不吸附卤化
银。该工艺包括在溶剂中,在 2-卤基-1-烷基
吡啶鎓盐和 4-二烷基
氨基吡啶的存在下,使两种
染料化合物发生反应。