蒽醌在乙二醇/Triton X胶束与乙二醇/三乙胺溶液中光还原的时间分辨电子自旋共振研究  

TR-ESR Study on Photoreduction of Anthraquinone in Ethylene Glycol/Triton Micelle and Ethylene Glycol/Triethylamine Solutions

作　　者：陆同兴[1] 许新胜[1] 洪新[1] 李干佐[2] 

机构地区：[1]安徽师范大学原子与分子物理研究所,芜湖241000 [2]山东大学胶体与界面化学教育部重点实验室,济南250100

出　　处：《化学学报》2006年第17期1824-1830,共7页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20473082)资助项目.

摘　　要：用时间分辨电子自旋共振研究了乙二醇/TritonX胶束与乙二醇/三乙胺溶液中蒽醌(AQ)的光还原.在蒽醌/乙二醇/TritonX/H2O胶束中,获得蒽半醌自由基AQH?的很强的TR-ESR信号,并检测到一定强度的负离子基AQ?-TR-ESR信号.在蒽醌/乙二醇/三乙胺/H2O体系中同时有较强的AQH?与AQ?-的TR-ESR信号.分析并讨论了蒽醌在两种体系中的还原过程.根据CIDEP的强度与TritonX及三乙胺浓度的关系,推求了三线态3AQ*对自由基AQH?的反应速率常数.根据化学诱导动态电子极化(CIDEP)信号随时间的变化,计算了AQH?的CIDEP弛豫时间.The photoreduction of anthraquinone in the ethylene glycol/Triton miceUe and ethylene glycol/triethylamine solution was studied with the time resolved electron spin resonance （TR-ESR） spectroscopy. The very strong TR-ESR signal of the semianthraquinone radical AQH^＊, formed from the hydrogen transfer from Triton X to 3AQ, was recorded in the ethylene glycol/Triton micelle, and the TR-ESR signal of the anthraquinone anion radical AQ^＊- was also detected in this micelle system. The significant TR-ESR signals of semianthraquinone radical AQH^＊ and anthraquinone anion radical AQ^＊- were obtained simultaneously in the anthraquinone/ethylene glycol/triethylamine system through two separate paths. The semianthraquinone radical AQH^＊ was generated through hydrogen transfer reaction from triethylamine, while anthraquinone anion radical AQ^＊- was produced through electron transfer reaction and the triethylamine was the donor. Based on the experimental results mentioned above, the photoreduction processes of anthraquinone in these two systems were analyzed in detail. At the same time, the reaction rate constants of the triplet 3AQ^＊ to radical AQH^＊ were deduced according to the dependence of CIDEP （chemically induced dynamic electron polarization） intensity on the concentration of Triton X and triethylamine. Furthermore, the relaxation time of radical AQH^＊ was also calculated from its time dependent CIDEP signal.

关 键 词：化学诱导动态电子极化 蒽半醌自由基 葸醌负离子基 三乙胺 表面活性剂 

分 类 号：O621.325[理学—有机化学]