Kinetics and mechanism of the oxidation of [N-(2-hydroxy-ethyl)ethylenediamine N,N′,N′-triacetatocobalt(II)] by vanadate ion

被引：5

作者：

Mansour, MA ^{[1
]}

机构：

[1] Ain Shams Univ, Fac Sci, Dept Chem, Cairo, Egypt

来源：

TRANSITION METAL CHEMISTRY | 2003年 / 28卷 / 03期

关键词：

D O I：

10.1023/A:1022966528585

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The kinetics of oxidation of Co-II HEDTA {HEDTA = N-(2-hydroxyethyl) ethylenediamine- N, N ',N'-triacetic acid} by vanadate ion have been studied in aqueous acid in the pH range 0.75-5.4 at 43-57 degreesC. The reaction exhibits second-order kinetics; first-order in each of the reactants. The reaction rate is a maximum at pH = 2.1. A mechanism is proposed in which the species [Co-II HEDTA(H2O)](-) and VO2+ react to form an intermediate which decompose slowly to give pentadentate Co-III HEDTA(H2O) and V-IV as final products. The rate law was derived and the activation parameters calculated: DeltaH* = 26.96 kJ mol(-1) and DeltaS* = -311.08 JK(-1) mol(-1).

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页码：276 / 279

页数：4

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