Kinetics and mechanism of hexachloroiridate(IV) oxidation of tellurium(IV) in aqueous solutions

被引：4

作者：

Hassan, Refat ^{[1
]}

Zaafarany, Ishaq ^{[2
]}

Takagi, Hideo ^{[3
]}

Ikeda, Yasuhisa ^{[4
]}

机构：

[1] Assiut Univ, Fac Sci, Dept Chem, Assiut 71516, Egypt

[2] Umm Al Qura Univ, Fac Sci Appl, Dept Chem, Makkah Al Mukarramah 13401, Saudi Arabia

[3] Res Ctr Phys Inorgan Sci, Sch Sci, Dept Chem, Nagoya, Aichi 46401, Japan

[4] Tokyo Inst Technol, Dept Nucl Engn, Tokyo 1528550, Japan

来源：

NEW JOURNAL OF CHEMISTRY | 2013年 / 37卷 / 09期

关键词：

ACIDIC PERCHLORATE SOLUTIONS; ELECTRON-TRANSFER REACTIONS; BINUCLEAR INTERMEDIATE; REDUCTION REACTIONS; REDOX REACTION; INNER-SPHERE; COMPLEXES; IV; CHROMIUM(II); URANIUM(IV);

D O I：

10.1039/c3nj00373f

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The kinetics of oxidation of tellurium(IV) by [IrCl6](2-) in aqueous perchlorate solutions at a constant ionic strength of 0.1 mol dm(-3) have been investigated spectrophotometrically. The results showed a first-order dependence in [IrCl6](2) , fractional-first-order kinetics with respect to tellurium(IV) concentration and second-order overall kinetics. The increase in the [H+] was found to be accompanied by a decrease in the rate constants, i.e., the oxidation reaction was acid-inhibited. Kinetic evidence for the formation of a 1 : 1 intermediate binuclear complex between the two reactants has been obtained. The ionization constant of tellurium(IV) has been evaluated and found to be 1.69 x 10(-3) dm(3) mol(-1) at 25 degrees C. The kinetic parameters have been calculated and a tentative reaction mechanism consistent with the kinetic data is suggested.

引用

页码：2700 / 2707

页数：8

共 53 条

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