波谱学杂志 ›› 1993, Vol. 10 ›› Issue (3): 233-240.

• 研究论文 • 上一篇    下一篇

关于氧化锌/双吡啶高氯酸盐非均相光诱导电子转移过程的研究

陈德文, 周建威, 刘延秋, 杨玉昆, 徐广智   

  1. 中国科学院化学研究所分子动态及稳态结构国家重点实验室, 北京 100080
  • 收稿日期:1992-06-22 修回日期:1993-01-19 出版日期:1993-09-05 发布日期:2018-01-20
  • 基金资助:
    国家自然科学基金

STUDIES ON THE PHOTOINDUCED ELECTRON TRANSFER PROCESSES IN ZINC OXIDE/PARAQUATS HETEROGENEOUS SYSTEMS

Chen Dewen, Zhou Jianwei, Liu Yanqiu, Yang Yukun, Xu Guangzhi   

  1. State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, The Chinese Academia Sinica, Beijing 100080
  • Received:1992-06-22 Revised:1993-01-19 Online:1993-09-05 Published:2018-01-20

摘要: 用ESR方法对9种不同双吡啶高氯酸盐与氧化锌组成的非均相体系的光诱导电子转移过程进行了系统的研究。ZnO-PQ++-胶束-苯的分散系,经350nm~420nm的紫外光照后,PQ++被还原成PQ+。具有大共轭结构的PQ+的ESR信号较强。胶束的存在也可使ESR信号增强。当体系充氧时,PQ+信号消失,并有超氧阴离子基O2·和羟基·OH被检出。

关键词: 氧化锌, 光诱导电子转移, 双吡啶盐, DMPO, 电子自旋共振

Abstract: The photoinduced electron transfer processes between zinc oxide and 9 kinds of Paraquats have been studied systematically by means of ESR. The dispersion system of ZnO-Paraquat-Micelle-benzene could give strong ESR signals after being irradiated by UV light, it means that photoinduced electron transfer processes between ZnO solid and Paraquat molecules took place without doubt, and PQ++ were reduced to form PQ+ radicals. The results also show that the PQ+ radicals with conjugation structure might give stronger ESR signals than those without conjugation structure; Micelle could also increase the strength of ESR signals; As oxygen was present in the system, ESR signals of PQ+ radicals disappeared, but spin adducts[DMPO-O2-]· and[DMPO-OH]· were detected. It is sure that the photoinduced electron transfer processes between ZnO and Paraquats can be seriously obstructed by oxygen.

Key words: Zinc oxide, Photoinduced electron transfer, DMPO, Paraquat, ESR