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.
一种制备摄影二元感光
染料的方法,其中包括两个分离的、非共轭的色团,其中一个具有吸附到
银卤化物晶粒表面的能力,另一个则基本不吸附
银卤化物。该过程包括在2-卤代-1-烷基
吡啶盐和4-双烷基
氨基吡啶的存在下,在溶剂中反应两种
染料化合物。