OXIDATION OF MANGANOUS AND FERROUS METALLOPORPHYRINS BY DIOXYGEN IN AQUEOUS-SOLUTIONS

被引：6

作者：

FLEISCHER, EB

FERRA, RV

机构：

[1] University of California, Irvine

来源：

JOURNAL OF INORGANIC BIOCHEMISTRY | 1979年 / 10卷 / 02期

关键词：

D O I：

10.1016/S0162-0134(00)81009-0

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：

The stoichiometry and rate of oxidation with dioxygen of tetra-(p-sulfonatophenyl)-porphinatomanganese(II) and the bisimidazole tetra(p-sulfonatophenyl)porphinato-iron(II) were studied in aqueous solutions at neutral pH. The stoichiometry for both complexes was determined; two molecules of metalloporphyrin reacted with dioxygen to produce the +3 oxidation state of the metalloporphyrins and hydrogen peroxide. The rate law for the oxidation of Mn(II)-TPPS is rate = k′[Mn(II)-TPPS][O2], with k′ at 26.5° of 2.6 × 105 M-1 sec-1. The rate law for the oxidation of Fe(II)-TPPS in the presence of imidazole is {A figure is presented} with k″ = 10,100 sec-1. Some possible mechanisms consistent with these data are discussed. © 1979.

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页码：91 / 100

页数：10

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