摘要
本文用时间分辨ESR波谱仪,研究了对苯醌/乙二醇/水体系中光解苯醌自由基的质子交换。观察了TRESR谱的线形与溶液的pH值关系.在溶液为中性时,谱线为BQH·的六条发射线,当pH~2.02时谱线为BQH2+的五条发射线.BQH2+的各超精细分量的衰减速率与因交换而移动的谱线所占份额有关,那些因交换而移动的线所占的份额越大。
The proton exchange of the photolyzed benzoquinone radical in the p benzoquinone/ethylene glycol/water system was invesitgated with time resolved ESR spectrometer. The dependence of the CIDEP spectra on the solution pH value was studied. When the solution was neutral there were six superfine emission lines which contributed to radical BQH ·, whicle pH value of the solution was ~2.02, five emission superfine lines were presented which contributed to radical BQH 2+ . The decay rates for different superfine lines for radical BQH 2+ were deferent, the lines, in which involved the greater fraction of the nuclear spin states that change resonance position on the proton exchange, were decayed slower than lines involved smaller fraction of one.
基金
国家自然科学基金
安徽省委教委资助