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
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.
引用
收藏
页码:91 / 100
页数:10
相关论文
共 25 条