TIME-RESOLVED EPR INVESTIGATION OF TRIPLET-STATE C-60 - TRIPLET-TRIPLET ANNIHILATION, CIDEP, AND QUENCHING BY NITROXIDE RADICALS

被引：51

作者：

GOUDSMIT, GH

PAUL, H

机构：

[1] Physikalisch-Chemisches Institut der Universität Zürich, CH-8057 Zurich

来源：

CHEMICAL PHYSICS LETTERS | 1993年 / 208卷 / 1-2期

关键词：

D O I：

10.1016/0009-2614(93)80079-5

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：

The paramagnetic species formed by laser flash irradiation of C60 in toluene at room temperature was investigated by time-resolved EPR spectroscopy and assigned to the triplet state C-3(60). It is formed by intersystem crossing with z magnetization M(z) almost-equal-to 0 and relaxes with T1 almost-equal-to T2 = 0.33 mus. Rate constants for triplet-triplet annihilation, k(TT) = 1.4 x 10(9) M-1 s-1 and triplet quenching by the TEMPO radical, k(q) = 2.4 x 10(9) M-1 s-1, were found, in satisfactory agreement with previous flash photolysis work. CIDEP, generated by the radical-triplet pair mechanism, was analyzed and found to be of equal size but opposite sign for the C-3(60) and TEMPO radical spin systems.

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页码：73 / 78

页数：6

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