高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (5): 731.

• 论文 • 上一篇    下一篇

SO4·-诱导含硫三电子键自由基的生成机理研究

徐业平1, 李全新1, 宋钦华1, 孙海虹1, 姚思德2, 俞书勤1, 陈从香1, 马兴孝1   

  1. 1. 中国科学技术大学化学物理系, 合肥 230026;
    2. 中国科学院上海原子核研究所, 上海 201800
  • 出版日期:1999-05-24 发布日期:1999-05-24
  • 通讯作者: 徐业平,男,43岁,博士研究生.
  • 作者简介:徐业平,男,43岁,博士研究生.

Studies on Mechanism of SO4·-Induced Formation ofRadicals Containing Sulphur Three electron Bond

XU Ye-Ping1, LI Quan-Xin1, SONG Qin-Hua1, SUN Hai-Hong1, YAO Si-De2, YU Shu-Qin1, CHEN Cong-Xiang1, MA Xing-Xiao1   

  1. 1. Department of Chemical Physics, University of Science Technology of China, Hefei, 230026;
    2. Laboratory of Radiation Chemistry, Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, Shanghai, 201800
  • Online:1999-05-24 Published:1999-05-24

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摘要： 运用248nm激光光解瞬态吸收光谱,研究了SO4·-单电子氧化D-甲硫氨酸(Met)、L-甲硫氨酸甲酯(MME)和甲硫氨酰甲硫氨酸(Met-Met)的反应过程.观察到反应过程中生成3种含硫三电子键自由基中间体,[S∴S]+、[S∴N]+和[S∴O],并分析了反应机理.

关键词: 激光光解, 含硫氨基酸, 反应机理, 三电子键

Abstract: The oxidation mechanism of D-methioine(Met), L-methioine-methyl ester(MME) and Met-Met dipeptides by SO4·-was investigated by using 248nm laser photolysis of K2S2O8and absorption spectrum. The presence of three electron radical cation intermediated [S∴S]+、[S∴N]+and [S∴O] were observed by transient absorption spectra. The results are compared to those of pulse radiolysis. Adetail oxidation mechanism of sulphur containing amino acids was proposed.

Key words: Laser photolysis, Sulphur containing amino acids, Reaction mechanism, Three electron bond

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