化学
动力学
电子转移
氧气
分解
反应机理
分子氧
氧原子
无机化学
单体
药物化学
离子
反应速率常数
物理化学
分子
催化作用
有机化学
聚合物
物理
量子力学
作者
Sabine Seibig and,Rudi van Eldik
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:1997-08-01
卷期号:36 (18): 4115-4120
被引量:149
摘要
A detailed mechanistic study of the reaction of [FeII(edta)] (edta = ethylenediaminetetraacetate) with molecular oxygen was conducted and the oxidation kinetics were investigated as a function of [FeII], [O2], pH, temperature, and pressure. The observed kinetic data in the presence of an excess of [FeII(edta)] can be accounted for in terms of a four-step mechanism: reaction of (I) [FeII(edta)H2O]2- with O2 by a substitution-controlled process to form [FeII(edta)O2]2-; (II) electron transfer to form an FeIII−superoxo species; (III) subsequent substitution on a second [FeII(edta)H2O]2- anion followed by electron transfer to give [FeIII(edta)−O22-−FeIII(edta)]4-; and (IV) a fast decomposition yielding the monomeric [FeIII(edta)]- and H2O2, which rapidly reacts with [FeII(edta)]. Rate and activation parameters for some of these steps are reported and discussed with reference to available literature data.
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