波谱学杂志 ›› 1998, Vol. 15 ›› Issue (3): 205-209.

• 研究论文 • 上一篇    下一篇

吩噻嗪-1,4萘醌-乙二醇体系光化学过程的时间分辨ESR研究

田秋1, 陈次平2, 何光龙1, 简华华1, 徐广智1   

  1. 1. 中国科学院化学研究所, 北京 100080;
    2. 中国科学院感光化学研究所, 北京 100101
  • 收稿日期:1998-01-09 修回日期:1998-03-09 出版日期:1998-06-05 发布日期:2018-01-13
  • 作者简介:田秋,女,41岁,工程师
  • 基金资助:
    国家自然科学基金

TIME-RESOLVED ESR STUDY ON THE PHOTOCHEMICAL PROCESS IN PHENOTHIAZINE/1,4-NAPHTHOQUINONE/ETHYLENE GLYCOL SYSTEM

Tian Qiu1, Chen Ciping2, He Guanglong1, Jian Huahua1, Xu Guangzhi1   

  1. 1. Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100080;
    2. Institute of Photographic Chemistry, The Chinese Academy of Sciences, Beijing 100101
  • Received:1998-01-09 Revised:1998-03-09 Online:1998-06-05 Published:2018-01-13

摘要: 用时间分辨ESR方法研究了吩噻嗪(PTH)-1,4-萘醌(NQ)-乙二醇(RH)体系中的光化学过程.只观察到萘醌的中性半醌自由基NQH*的全发射极化的CIDEP(化学诱导动态极化)信号,并未观察到极化的萘醌负离子NQ·-*的CIDEP信号,表明RH与三重态NQ间的质子转移反应远比PTH与NQ间的电子转移反应为快.NQH·*的CIDEP信号随pH值的变化表明体系中同时有极化自由基NQH·*与NQH·2+*存在,并且其间有质子交换.

关键词: 质子转移, 自由基, CIDEP

Abstract: The photoinduced hydrogen transfering reaction in phenothiazine/1,4-naphthoquinone/ethylene glycol system has been investigated by time-resolved electron spin resonance technique. From the measured emission CIDEP signals of neutral 1,4-naphtho semiqinone radical NQH·*, it is concluded that the rate of hydrogen transfering reaction between ethylene glycol and 1,4-naphthoquinone is much faster than the rate of electron transfering reaction between phenothiazine and 1,4-naphthoquinone. The broadened CIDEP spectra obtained in acidic solution of 1,4-naphthoquinone/ethylene glycol systems indicate that a fast proton exchange process must exist between the spin polarized radicals NQH·* and NQH·2+*.

Key words: TRESR, CIDEP, Proton transfer