TIME-RESOLVED EPR STUDY ON THE EXCITED TRIPLET-STATE OF NONPHOSPHORESCENT TROPONE

被引：14

作者：

IKOMA, T ^{[1
]}

AKIYAMA, K ^{[1
]}

TEROKUBOTA, S ^{[1
]}

IKEGAMI, Y ^{[1
]}

机构：

[1] TOHOKU UNIV,INST CHEM REACT SCI,KATAHIRA 2-1-1,AOBA KU,SENDAI,MIYAGI 980,JAPAN

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1991年 / 95卷 / 19期

关键词：

D O I：

10.1021/j100172a003

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 magnetic property and decay kinetics of the nonphosphorescent triplet (T1) state of tropone in glassy matrices have been studied by employing the time-resolved EPR (TREPR) method with excimer and dye laser excitations. The T1 state was assigned to be nearly pure 3-pi-pi* in character from the small zero-field splitting (zfs) parameters (\D\ = 0.077 cm-1 and \E\ = 0.011 cm-1 in a toluene glassy matrix) and their small dependency on the matrix polarity. The directions of the principal axes of the zfs tensor were determined by magnetophotoselection experiments with two colors of lasers. It was found that the T1(pi-pi*) state of tropone has very short lifetime; the average rate constant from the zero-field spin sublevels is 2 x 10(5) s-1.

引用

页码：7119 / 7121

页数：3

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