An investigation of the solvent dependence on the ultrafast intersystem crossing kinetics of xanthone

被引:77
作者
Cavaleri, JJ [1 ]
Prater, K [1 ]
Bowman, RM [1 ]
机构
[1] UNIV KANSAS,DEPT CHEM,LAWRENCE,KS 66045
基金
美国国家科学基金会;
关键词
D O I
10.1016/0009-2614(96)00782-8
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The photophysics of xanthone in solution are measured using femtosecond pump-probe techniques. A kinetic model which includes intersystem crossing from both the (1) pi pi* and (1)n pi* electronic states accurately represents the non-single exponential growth of the triplet-triplet absorption after excitation into the (1) pi pi* state at 310 nm. The intersystem crossing rate constants are consistent with an 'inverse' gap effect due to solvent polarity induced shifts in the electronic states. The branching between intersystem crossing from the (1) pi pi* and (1)n pi* electronic states is also solvent dependent and is determined by the rate constant for internal conversion in the singlet electronic state.
引用
收藏
页码:495 / 502
页数:8
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