【摘要】 利用时间分辨激光诱导瞬态吸收光谱装置 ,以一台Nd :YAG激光器四倍频后的 2 66nm激光作为激发光源 ,详细研究了两种喹喔啉衍生物激发三重态在乙腈体系中的动力学过程 ,得到激光脉冲作用后不同时间的瞬态吸收光谱及激发三重态自猝灭反应动力学常数 .并以五种缺电子烯烃作为猝灭剂 ,得到了基态缺电子烯烃对喹喔啉衍生物激发三重态的猝灭反应动力学常数 ,阐明了猝灭反应机理 .更多还原

【Abstract】 The photochemistry of quinoxalines 1 and 2 in acetonitrile has been investigated by using time-resolved laser flash photolytical technique. The transient absorption spectra of the excited quinoxalines have been obtained. 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 quinoxalines (1 and 2) and five electron-poor alkenes have been determined respectively by using 266 nm laser at room temperature. In addition, the mechanism of the quenching of transient species has also been suggested.更多还原