影像科学与光化学 ›› 1989, Vol. 7 ›› Issue (3): 27-33.DOI: 10.7517/j.issn.1674-0475.1989.03.27

• 研究论文 • 上一篇    下一篇

有机锡化合物光解活泼自由基的ESR研究

王秀华1, 刘扬1, 徐广智1, 梁任又2   

  1. 1. 中国科学院化学研究所, 北京 100080;
    2. 中国科学技术大学结构成分分析中心, 合肥
  • 收稿日期:1988-02-23 修回日期:1988-12-26 出版日期:1989-08-20 发布日期:1989-08-20
  • 基金资助:
    国家自然科学基金

ESR STUDY ON THE ACTIVE FREE RADICALS FORMED DURING THE PHOTOLYSIS OF ORGANO-STANNUM COMPOUNDS

WANG XIU-HUA1, Liu YANG1, Xu GUANG-ZHI1, LIANG REN-YOU2   

  1. 1. Institute of Chemistry, Academia Sinica, Beijing 100080;
    2. University of Science and Technology of China, Hefei, P. R. China
  • Received:1988-02-23 Revised:1988-12-26 Online:1989-08-20 Published:1989-08-20

摘要: 本文用自旋捕捉技术与ESR相结合的方法,研究了六种有机锡化合物的光解反应历程。结果表明:有机锡化合物紫外光照时,碳-锡键发生均裂,产生碳中心和锡中心自由基。其中碳中心自由基易被捕捉剂α-苯基-N-特丁基氮氧化物(PBN)或2,3,5,6-四甲基亚硝基苯(ND)所捕获;而锡中心自由基可与菲醌形成稳定的环状加合物。由于环状加合物中配体的不同,产生的空间效应也不同,从而导致加合物中的未偶电子云密度发生变化,给出相异的ESR信号。

关键词: 有机锡, 光解, 活泼自由基, 电子顺磁共振, 自旋捕捉

Abstract: Active free radicals produced during the photolysis of organo-stannum compounds have been studied by the combination of spin trapping technique and ESR spectroscopy. The results show that during the UV irradiation the C-Sn bond of organo-stannum compounds is cleaved and both C-centre and Sn-centre radicals are produced, of which the C-centre radical can be trapped by PBN or ND and a stable cyclic adduct is formed from Sn-centre radical and phenanthrenequinone. It is also interesting to note that owing to the different coordinate of cyclic adduct and the difference of steric effect, the ESR signal is quite different and the spin density on the adduct is changed.

Key words: photolysis, radicals, ESR, spin trapping, organo-stannum compounds