PHOTOEXCITATION OF POTASSIUM OCTACYANOTUNGSTATE(IV) AND 2,2'-BIPYRIDYL - KINETICS AND MECHANISM

被引：7

作者：

ALI, SI

KAUR, H

机构：

[1] Department of Chemistry, Jamia Millia Islamia, New Delhi

来源：

TRANSITION METAL CHEMISTRY | 1992年 / 17卷 / 04期

关键词：

D O I：

10.1007/BF02910894

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The reaction kinetics of photochemically generated [W(CN)7OH]4- in basic medium and [W(CN)6(CNH)(H2O)]2- in acidic medium with 2,2'-bipyridyl have been studied in buffer solutions of pH 4.2-10.6, ionic strength 8.0 X 10(-2) M at 20-degrees-C. The quantum yield for formation of the photoproduct was found to depend upon the pH, ligand and [W(CN)8]4- concentrations. The pseudo-first order rate constant and quantum yield in acidic medium are higher than in basic medium, due to weakening of the W-CN sigma-bond when the nitrogen of the cyano group in the complex is protonated. The mechanisms associated with the photosubstitution are different in the two media. The ionic strength does not affect the reaction rate, implying that the mechanism is not dissociative.

引用

页码：304 / 306

页数：3

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