Unusual triplet state relaxation in C60 oxide

被引：14

作者：

Benedetto, AF

Weisman, RB

机构：

[1] Rice Univ, Dept Chem, Houston, TX 77251 USA

[2] Rice Univ, Rice Quantum Inst, Houston, TX 77251 USA

来源：

CHEMICAL PHYSICS LETTERS | 1999年 / 310卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0009-2614(99)00718-6

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 C60O has been investigated. The calibrated UV-visibIe absorption spectrum, fluorescence quantum yield, and triplet-triplet absorption spectrum are compared to those of C-60. Intrinsic triplet decay is anomalous, with typically weak temperature dependence below 180 K but unusual strong activation (E-A = 20 kJ mol(-1)) above. At 295 K, the triplet lifetime is only 4.2 ps, or 34 times shorter than that of C-60. It is proposed that the activated decay channel involves reversible cleavage of the C-C epoxide bond. C60O efficiently quenches triplet C-60 with a rate constant of 3.6 X 10(9) M-1 s(-1). (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：25 / 30

页数：6

共 23 条

[1] EPR studies of the excited triplet states of C60O and C60C2H4N(CH3) fullerene derivatives and C-70 in toluene and polymethylmethacrylate glasses and as films [J].