2,4,6-Trisubstituted pyridines wherein at least one of the substituents is a para-(N,N-diarylamino)phenyl group, and the other two substituents are alkyl, cycloalkyl or aryl groups are useful as image dyes in acid-mediated imaging media, since the colored forms of these dyes display improved photostability as compared with similar trisubstituted pyridines which lack the para-(N,N-diarylamino)phenyl group. Salts of these trisubstituted pyridines are also useful in sensitizing 'onium salts to blue visible or similar radiation.
2,4,6-三取代
吡啶,其中至少一个取代基是对位-(N,N-二芳基
氨基)苯基,另外两个取代基是烷基、环烷基或芳基,可用作酸介导成像介质中的显影
染料,因为这些
染料的有色形式与缺乏对位-(N,N-二芳基
氨基)苯基的类似三取代
吡啶相比,具有改善的光稳定性。这些三取代
吡啶的盐也可用于增敏'烷盐对蓝光可见或类似辐射的敏感性。