Quantitative spectroscopic studies of the photoexcited state properties of methano- and pyrrolidino-[60]fullerene derivatives

被引:65
作者
Ma, B [1 ]
Bunker, CE [1 ]
Guduru, R [1 ]
Zhang, XF [1 ]
Sun, YP [1 ]
机构
[1] CLEMSON UNIV,HOWARD L HUNTER CHEM LAB,DEPT CHEM,CLEMSON,SC 29634
关键词
D O I
10.1021/jp971067k
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
UV/vis absorption and fluorescence spectra and fluorescence quantum yields and lifetimes of a series of methano- and pyrrolidino-[60]fullerene derivatives in different solvents are studied systematically. The absorption and fluorescence properties of the derivatives with different substituents are somewhat different from those of [60]fullerene, but very similar among themselves, indicating that the low-lying transitions and the photoexcited state processes are dictated by the electronic structures of functionalized [60]fullerene cages. The results also allow an examination of the issue concerning discrepancies between experimentally determined transition probabilities and those calculated in terms of the Strickler-Berg equation for fullerene molecules. In addition, quenchings of the excited singlet states of the [60]fullerene derivatives by electron donor N,N-diethylaniline (DEA) and the formation of emissive fullerene-DEA exciplexes in solvents of different polarities are investigated.
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页码:5626 / 5632
页数:7
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