The first observation of CIDEP generated through the interaction between an excited singlet oxygen molecule and a free radical

被引：27
|
作者：
Mitsui, M
Takeda, K
Kobori, Y
Kawai, A
Obi, K
机构：
[1] Department of Chemistry, Tokyo Institute of Technology, Tokyo 152, Ohokayama, Meguro-ku
来源：
CHEMICAL PHYSICS LETTERS | 1996年 / 262卷 / 1-2期
关键词：
D O I：
10.1016/0009-2614(96)01058-5
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：
Chemically induced dynamic electron polarization (CIDEP) generated through the interaction between the lowest excited singlet oxygen molecule and 2,2,6,6,-tetramethylpiperidinyl-1-oxyl (TEMPO) radical was observed by the time-resolved ESR technique. Excited singlet oxygen molecules were produced by the triplet sensitizer through energy transfer. Absorptive electron spin polarization was generated on the free radical in the excited singlet oxygen molecule - free radical system, in which the CIDEP generation was interpreted by the radical-triplet pair mechanism with doublet precursor (DP-RTPM). The CIDEP time profile was successfully analyzed by using the Bloch equations. Quenching of O-1(2) by beta-carotene provides further evidence for DP-RTPM in the O-1(2)-TEMPO system.
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页码：125 / 130
页数：6
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