TIME-RESOLVED EPR AND FOURIER-TRANSFORM EPR STUDY OF TRIPLET C-60 - DETERMINATIONS OF T1 AND THE C-13 HYPERFINE COUPLING-CONSTANT

被引:33
作者
ZHANG, D
NORRIS, JR
KRUSIC, PJ
WASSERMAN, E
CHEN, CC
LIEBER, CM
机构
[1] ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439
[2] UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637
[3] DUPONT CO INC,CENT RES & DEV,WILMINGTON,DE 19880
[4] HARVARD UNIV,DEPT CHEM,CAMBRIDGE,MA 02138
关键词
D O I
10.1021/j100124a018
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
Continuous wave (CW) and time-resolved (TR) EPR spectra of triplet C60 with partial and full C-13 enrichment in methylcyclohexane solutions after UV irradiation were obtained. Line broadening from C-13 satellites was observed. The C-13 hyperfine coupling constant was determined to be 0.06 G. Fourier transform EPR (FT-EPR) experiments with a resolution of 20 ns were carried out, and T1 was found to be 0.8 +/- 0.1 mus by fitting the intensity of the free induction decay signal to the modified Bloch equations. The relaxation time from FT-EPR is in excellent agreement with estimations from the line width of CW-EPR. Because the C-13 hyperfine coupling constant is so small, no distinct satellite lines were observed with C-13 in natural abundance at 200 K.
引用
收藏
页码:5886 / 5889
页数:4
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