Dynamic study of photosensitized one-electron oxidation of polyG by menadione  

作　　者：MA Jianhua1,LIN Weizhen2,DU Fuqiang2,HAN Zhenhui2,YAO Side2 & LIN Nianyun2 1.College of Biology Engineering,Jimei University,Xiamen 361021,China 2.Laboratory of Nanobiomedicine & Laboratory of Radiation Chemistry,Shanghai Institute of Applied Physics,Chinese Acade Sciences,Shanghai 201800,China 

出　　处：《Science China Chemistry》2005年第4期292-296,共5页中国科学（化学英文版）

基　　金：the National Natural Science Foundat ion of China(Grant Nos.20133020&39830090); the Photo Science&Technology Research Foundat ion of Science and Technology Committee of Shanghai.

摘　　要：The electron transfer reaction of triplet menadione (3MQ?) with polyguanylic acid (polyG) in CH3CN rich (97%) solution was investigated by 248 nm(KrF) laser flash photolysis.The transient absorption spectra and kinetics obtained from the interaction of 3MQ? with polyG demonstrated that the primary radical ion pair,radical cation of polyG and radical anion of me-nadione can be detected simultaneously.The results demonstrated that the reaction rate con-stant of 3MQ? with polyG is almost equal to that of 3MQ? with dGMP.The electron transfer reaction of triplet menadione (3MQ?) with polyguanylic acid (polyG) in CH3CN rich (97%) solution was investigated by 248 nm(KrF) laser flash photolysis.The transient absorption spectra and kinetics obtained from the interaction of 3MQ? with polyG demonstrated that the primary radical ion pair,radical cation of polyG and radical anion of me-nadione can be detected simultaneously.The results demonstrated that the reaction rate con-stant of 3MQ? with polyG is almost equal to that of 3MQ? with dGMP.

关 键 词：menadione  polyG  laser FLASH photolysis  TRIPLET state  one ELECTRON oxidation. 

分 类 号：O621[理学—有机化学]