Solvent and chelation effects on the photoreduction of cobalt(III)-amine complexes in aqueous-organic solvent media

被引：15

作者：

Karthikeyan, G ^{[1
]}

Anbalagan, K ^{[1
]}

Elango, KP ^{[1
]}

机构：

[1] Deemed Univ, Gandhigram Rural Inst, Dept Chem, Gandhigram 624302, India

来源：

TRANSITION METAL CHEMISTRY | 2002年 / 27卷 / 01期

关键词：

D O I：

10.1023/A:1013435117030

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The photoreduction of trans-[Co(NH3)(4)Cl-2](+), trans-[Co(en)(2)Cl-2](+), [Co(dien)Cl-3], [Co(trien)Cl-2](+), and [Co(tetren)Cl](2+), ions has been studied using a low pressure Hg vapour lamp as light source (254 nm) in aqueous-organic solvents [0-30% (v/v) MeOH or 1,4-dioxane]. Quantum yields for Co-II production by redox decomposition have been determined in all the cases, and increase considerably with the increase in concentration of MeOH or 1,4-dioxane in the binary solvent mixtures under investigation. A plot of log(quantum yield) versus the Grunwald-Winstein Parameter, Y, which is a measure of solvent ionizing power, shows that a different blend of general and specific solvent interacts with the solute. This kind of specific solvent interaction on the reactant/excited state has been analysed using multiple regression: viz. Krygowski-Fawcett and Kamlet-Taft equations. Reasons for the difference in reactivity with chelation are also discussed.

引用

页码：52 / 57

页数：6

共 27 条

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