KINETICS OF TRIPLET OXIDATION OF METALLOPORPHYRIN COMPOUNDS TO THEIR CORRESPONDING RADICAL CATIONS

被引：20

作者：

POTTER, W

LEVIN, G

机构：

[1] Department of Chemistry, State University of New York, College of Environmental Science and Forestry, Syracuse, New York

来源：

PHOTOCHEMISTRY AND PHOTOBIOLOGY | 1979年 / 30卷 / 02期

关键词：

D O I：

10.1111/j.1751-1097.1979.tb07139.x

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Abstract— The kinetics of photooxidation of triplets of metalloporphyrin compounds to their corresponding radical cations was investigated. Zn‐tetraphenyl porphyrin (ZnTPP) and Mg‐tetraphenylpor‐phyrin (MgTPP) triplets were oxidized by europium salt with rate constants of 4.8 × 105M‐1s‐1 and 2.1 × 106M‐1s‐1, respectively. The high rate constant of oxidation of MgTPP triplet might be related to the ground state oxidation potential, being 0.54 V (SCE) for the Mg complex and 0.71 (SCE) for the Zn complex. The rate constant of oxidation of ZnTPP excited singlet is in the order of diffusion control, i.e. ˜ 1010M ‐1 s‐1. Excitation of ferric, cupric, cobaltic, and vanadyl tetraphenylporphyrin did not result in a long‐lived triplet state that would allow oxidation studies using flash photolysis. Copyright © 1979, Wiley Blackwell. All rights reserved

引用

页码：225 / 231

页数：7

共 21 条

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