物理化学学报 >> 2002, Vol. 18 >> Issue (04): 346-349.doi: 10.3866/PKU.WHXB20020412

研究简报 上一篇    下一篇

蒽醌/氢给体/氮氧自由基的瞬态电子自旋极化

张先炎炎;许新胜;陆同兴;崔执凤;李海洋   

  1. 安徽师范大学物理与电子信息学院,芜湖 241000; 中国科学院安徽光学精密机械研究所环境光谱学实验室,合肥 230031
  • 收稿日期:2001-07-31 修回日期:2001-11-08 发布日期:2002-04-15
  • 通讯作者: 张先炎炎 E-mail:xianyizhang@263.net

Transient Electron Polarization of Anthraquinone/Hydrogendonor/2,2,6,6tetramethylpiperidinyloxyl

Zhang Xian-Yi;Xu Xin-Sheng;Lu Tong-Xing;Cui Zhi-Feng;Li Hai-Yang   

  1. Department of Physics, Anhui Normal University, Wuhu 241000;Environment Spectroscopy Laboratory Anhui Institute of Optics and Fine Mechanics,The Chinese Academy of Sciences, Hefei 230031
  • Received:2001-07-31 Revised:2001-11-08 Published:2002-04-15
  • Contact: Zhang Xian-Yi E-mail:xianyizhang@263.net

摘要: 用时间分辨电子自旋共振波谱仪研究了光解蒽醌/乙二醇、蒽醌/乙二醇/氮氧自由基体系的化学诱导动态电子自旋极化.实验结果指出,在蒽醌/乙二醇/氮氧自由基(AQ/EG/TEMPO)体系中,存在自由基三重态对(RTPM)和三重态(TM)极化的竞争,并由此讨论了三重态自由基对的反应速率.

关键词: 电子自旋极化, 自由基三重态对机理, 三重态机理, 三重态猝灭

Abstract: The chemically induced dynamic electron polarization(CIDEP) of the antheraquinone(AQ)/ethylene glycol(EG) and AQ/EG/2,2,6,6tetramethylpiperidinyloxyl(TEMPO) systems were investigated using timeresolved ESR spectrometer. In AQ/EG system, the electron spin polarized signal of antheraquinone radical is generated due to hydrogen abstraction from EG(Fig.1), this is a triplet mechanism(TM) accompanied by radical pair mechanism(RPM). On the an addition of TEMPO to the system, the chemically induced dynamic electron polarization signal of TEMPO is also evident, this is a radicaltriplet pair mechanism(RTPM), so in the AQ/EG/TEMPO system,there are competition between RTPM and TM or RPM polarization, along with the change of the concentration of TEMPO in the solution, the signal intensities of antheraquinone radical and TEMPO are changed(Fig.2 and Fig.3), from this competition, the reaction rate of the radicaltriplet pair has been deduced(Table 1).

Key words: Electron spin resonance, Radicaltriplet pair mechanism, Triplet mechanism, Triplet quenching