异喹啉的脉冲辐解和激光光解研究  

Pulse radiolysis and laser flash photolysis of isoquinoline

作　　者：朱大章[1] 汪世龙[2] 孙晓宇[2] 严钱钱[2] 倪亚明[1] 姚思德[3] 王文峰[3] 

机构地区：[1]同济大学化学系,上海200092 [2]同济大学生命科学与技术学院,上海200092 [3]中国科学院上海应用物理研究所,上海201800

出　　处：《辐射研究与辐射工艺学报》2007年第2期102-106,共5页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金(50572074)资助

摘　　要：用脉冲辐解和激光光解相结合,研究了异喹啉这种难降解杂环化合物在紫外光作用下的变化和与HO·的反应。结果表明,在波长为266nm的激光作用下,异喹啉不仅发生光激发,而且发生单光子电离,其量子产额为1.58×10-4。异喹啉光电离产生的阳离子自由基可以脱去质子,其pKa为5.50。异喹啉可以与HO·发生反应,其反应速率常数为3.4×109mol-1·dm3·s-1。本工作的研究将为photo-Fenton法降解异喹啉提供理论上的依据。The performance of isoquinoline, a kind of nondegradable N-heterocyclic compound, under the irradiation of UV light and its reaction with HO· were investigated by pulse radiolysis and laser flash photolysis. It was shown that both photo-excitation and monophoto-ionization with the quantum yield of 1.58×10^-4 happened in isoquinoline under the irradiation of the laser pulse of 266nm. The cation radical of isoquinoline produced by photo-ionization could deprotonate to form its conjugate base mediate radical with the pKa of 5.50. Pulse radiolysis showed that isoquinoline could react with HO· very rapidly with the rate constant of 3.4×10^9 mol^-1·dm^3 ·s^-1. With a better understanding on pulse radiolysis and laser flash photolysis of isoquinoline, this study is helpful for its degradation and for environment protection.

关 键 词：异喹啉 激光光解 脉冲辐解 羟基自由基 光电离 

分 类 号：O644.18[理学—物理化学] O626.3[理学—化学]