CH(A^2△)自由基被醇类分子猝灭动力学的温度效应研究  

Temperature Effect on Quenching of CH(A) by Alcohol

作　　者：陈从香[1] 王非[1] 陈益新 冉琴[1] 马兴孝[1] 

机构地区：[1]中国科学技术大学化学物理系,合肥230026

出　　处：《化学学报》1998年第6期570-574,共5页Acta Chimica Sinica

基　　金：国家自然科学基金资助课题(29473128)

摘　　要：用266nm激光光解CHBr_3产生CH自由基,利用精密控温仪控制反应温度,测定CH(A→X)荧光的时间分辨信号,测量了290K至653K范围内CH(A)被乙醇、丙醇、丁醇猝灭的速率常数,利用修正的碰撞配合物模型,定性解释了在多极吸引势与活化势垒的双重影响下,猝灭截面与温度间的关系.The quenching rate constants of CH(A2△) radical by alcohol molecules, such as C2H5OH, n -C3H7OH and n - C4H9OH, between 290K and 653K have been measured using laser photolysis of CHBr3 at 266nm to produce CH(A) radical and time - resolved fluorescence measurements. Under the simultaneous effects of multipole attractive potential and repulsive barrier, the temperature dependence is analyzed qualitatively based on a modified collision complex model.

关 键 词：次甲基自由基 醇类分子 猝灭 碰撞配合物 

分 类 号：O621.146[理学—有机化学]