Cyanine dyes are disclosed having a nucleus of the formula :
in which ;
A and B are independently selected from heterocyclic ring nuclei and heterocyclic fused ring nuclei to complete a cyanine dye,
m and n independently have values of 0, 1, 2 or 3 with the proviso that 2 Z m + n ≦ 4,
R represents a hydrogen atom, an alkyl group or an aryl group, each of which groups may optionally be substituted, and
Q represents those non-metallic atoms necessary to complete a nucleus of a heterocyclic ring, a carbocyclic ring or a carbocyclic or heterocyclic fused ring system.
The cyanine dyes of formula (I) may be used to spectrally sensitise silver halide grains to radiation in the wavelength range from 650 nm upwards, especially 700 to 850 nm, to provide infrared-sensitive, silver halide photographic materials which are particularly suitable for use with electronically modulated exposure sources, such as lasers and light emitting diodes.
公开了具有式......核的
氰基
染料:
其中;
A 和 B 独立地选自杂环环核和杂环融合环核,以完成
氰基
染料、
m 和 n 独立地具有 0、1、2 或 3 的值,但 2 Z m + n ≦ 4、
R 代表氢原子、烷基或芳基,其中每个基团均可任选被取代,以及
Q 代表完成杂环、碳环或碳环或杂环融合环系统核心所需的非
金属原子。
式 (I) 的
氰基
染料可用于使卤化
银颗粒对波长范围为 650 纳米以上,特别是 700 至 850 纳米的辐射进行光谱感光,以提供对红外线敏感的卤化
银感光材料,这种材料特别适合与电子调制曝光源(如激光器和发光二极管)一起使用。