摘要
对苯二胺类彩色显影剂(PPD_s)经两步电子转移依次生成半醌自由基(SQDI_s)和醌二亚胺(QDI_s)。半醌自由基在可见光范围(460～550nm)有很强的特征光吸收,监测半醌的吸光度变化即可跟踪反应进程,因此PPD_s是研究氧化还原机理的理想模型。
The protoration constants of the color developer CD-4 are measured by means of spectrometry in this paper.Those values are 107.2dm3 mol-1;102.7 dm3mol-1 respectively which is very closed to obtained results by cyclic voltammetry method.The molar extinction coefficient of the semiquinone of CD-4 is measured in the HAc-NaAc medium by measuring intermediate molar extinction coefficient melhod.The value is (9.62 + 0.22) 103dm3 mol-1 cm-1 (298K)
出处
《感光科学与光化学》
CSCD
1990年第1期58-62,共5页
Photographic Science and Photochemistry
关键词
彩色显影剂
质子化常数
苯二胺
color developer,protonation constants,semiquinone,molar extinction coefficient
