摘要
利用时间分辩激光诱导瞬态吸收光谱装置 ,以 2 6 6nm激光为激发光源 ,两种喹喔啉衍生物为光敏剂 ,三种缺电子烯为猝灭剂 ,得到了喹喔啉衍生物激发三重态在乙腈体系中的瞬态吸收光谱 ,并且测定了喹喔啉衍生物的激发三重态自猝灭反应动力学常数以及缺电子烯对三重态的猝灭反应动力学常数 .此外 ,还以 2 ,3 二甲基萘为光敏剂作为比较 ,给出一系列的猝灭速率常数 。
The photochemistry of quinoxalines 1 and 2 in acetonitrile is investigated by using time resolved laser flash photolytical technique. The self quenching rate constants (k sq ) of excited triplet states of quinoxalines and the rate constants (k q) for the reactions between excited triplet states of 1,2 and three electron poor alkenes are determined respectively by using 266nm laser at room temperature. In addition, 2,3 dimethylnaphthalene is used as another photosensitizer to compare with compounds 1 and 2. The triplet triplet absorption spectrums of the excited quinoxalines are obtained, and the mechanism of the formation of transient species is suggested.
基金
国家自然科学基金 (2 0 2 730 6 6 )
高水平大学建设资助项目
关键词
喹喔啉
光敏剂
激发三重态
缺电子烯
quinoxaline
photosensitizer
excited triplet state
electron poor alkene
