杜醌自由基光化学路径的CIDEP研究(英文)  

A CIDEP study on the photochemical route of duroquinone radicals

作　　者：许新胜[1] 朱光来[2] 洪新[2] 崔执凤[2] 陆同兴[2] 张为俊[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所,合肥230031 [2]安徽师范大学原子与分子物理研究所,芜湖241000

出　　处：《原子与分子物理学报》2006年第2期232-236,共5页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(20473082);安徽省原子与分子物理重点学科建设基金

摘　　要：用自制的高时间分辨电子自旋共振波谱仪,测量得到了酸性、碱性和胶束环境下的光解杜醌/乙二醇(DQ/EG)溶液瞬态自由基的化学诱导动态电子自旋极化(CIDEP)谱.在光解均相DQ/EG溶液时,观察到了以增强发射的的中性杜半醌自由基(DQH.)的CIDEP信号;在碱性环境下(pH=9)和TX-100胶束环境下光解DQ/EG体系时得到杜醌负离子自由基(DQ-.)的CIDEP信号;在酸性环境下(pH=2.5)光解DQ/EG体系时,出现的又是中性杜半醌自由基(DQH.)的CIDEP信号.实验结果显示,DQH.由3DQ*与EG之间的氢原子转移反应生成,DQ.-由DQH.的去质子化反应生成,反应中伴随着极化转移.The CIDEP spectra of the transient radicals in the photolysis of duroquinone（DQ）/ethylene glycol （EG） system in acid, basic and micellar environment were measured with the homemade highly time-resolved ESR spectrometer. In the DQ/EG homogeneous solution, the enhanced emissive CIDEP signal of the neutral durosemiquinone radical DQH^· was observed. When the DQ/EG solution with pH = 9 or DQ/EG/TX-100/ H20 micelle system was photolyzed, the CIDEP signal of the duroquinone anion radical （DQ^·-） was obtained. When the DQ/EG solution with pH = 2.5 was irradiated, the CIDEP signal of DQH^· appeared. These experimental results indicate that the neutral radical DQH^· was formed through the proton transfer from EG to 3DQ^＊ and DQ^·- was formed from the dissociation of DQH^· accompanying polarization transfer.

关 键 词：杜醌 CIDEP TR-ESR TX-100胶束 

分 类 号：O562.31[理学—原子与分子物理] O413.1[理学—物理]