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．
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.
出处
《波谱学杂志》
CAS
CSCD
北大核心
1998年第3期205-210,共6页
Chinese Journal of Magnetic Resonance
基金
国家自然科学基金
