Light-absorbing fluorine-containing 2-pyrazolin-5-one methine oxonol dyes corresponding to the formula
wherein R is C1-C5 alkyl, aryl, alkoxycarbonyl, carboxy, or carbamoyl, and n is 0, 1, or 2.
The dyes can be used in light-sensitive silver halide materials in an antihalation layer, in a filter layer or as screening dyes in a light-sensitive layer. They manifest great stability while in dissolved state within a very large pH-range and they are decolourized easily in one of the processing baths. They are prepared by joining 2 appropriately substituted pyrazolone rings in 4-position by 1 methine group through reaction with an ester of an orthocarboxylic acid or by a tri- or pentamethine group through reaction with β-anilinoacrolein anil HCI or glutaconic dialdehyde dianil HCI respectively.
具有光吸收功能的含
氟 2-
吡唑啉-5-酮甲氧羰基
酚染料,其对应式为
其中 R 是 C1-C5 烷基、芳基、烷氧羰基、羧基或
氨基甲酰基,n 是 0、1 或 2。
这些
染料可用于光敏卤化
银材料中的防光晕层、过滤层或光敏层中的屏蔽
染料。在很大的 pH 值范围内,它们在溶解状态下表现出很高的稳定性,而且在其中一种加工浴中很容易脱溶。它们的制备方法是:将 2 个适当取代的
吡唑酮环在 4 位上连接 1 个甲基,然后与原
羧酸的
酯类反应,或分别与 β-
苯胺基
丙烯醛 anil HCI 或
戊二醛 dianil HCI 反应,连接 1 个三甲基或五甲基。