Acta Chimica Sinica ›› 2006, Vol. 64 ›› Issue (17): 1824-1830. Previous Articles     Next Articles

Original Articles

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

陆同兴*,1; 许新胜1; 洪新1; 李干佐2   

  1. (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)
  • 收稿日期:2005-09-21 修回日期:2006-05-08 出版日期:2006-09-14 发布日期:2006-09-14
  • 通讯作者: 陆同兴

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

LU Tong-Xing*,1; XU Xin-Sheng1; HONG Xin1; LI Gan-Zuo2   

  1. (1 Atom and Molecular Institute, Anhui Normal University, Wuhu 241000)
    (2 Key Laboratory for Colloid and Interface Chemistry of the Ministry of Education of China, Shandong University, Jinan 250100)
  • Received:2005-09-21 Revised:2006-05-08 Online:2006-09-14 Published:2006-09-14
  • Contact: LU Tong-Xing

The photoreduction of anthraquinone in the ethylene glycol/Triton micelle 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.

Key words: chemically induced dynamic electron polarization, semianthraquinone radical, anthraquinone anion radical, triethylamine, surfactant