Measurement of the diffusion coefficients of [Ru(NH3)6]3+ and [Ru(NH3)6]2+ in aqueous solution using microelectrode double potential step chronoamperometry

被引：154
|
作者：
Wang, Yijun [1 ]
Limon-Petersen, Juan G. [1 ]
Compton, Richard G. [1 ]
机构：
[1] Univ Oxford, Dept Chem, Phys & Theoret Chem Lab, Oxford OX1 3QZ, England
来源：
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2011年 / 652卷 / 1-2期
关键词：
Diffusion coefficient; Hexaammineruthenium(III); Hexaammineruthenium(II); Ion-pairing; Stokes-Einstein equation; TEMPERATURE IONIC LIQUIDS; SUPPORTING ELECTROLYTE; RADICAL CATIONS; REDOX COUPLES; VOLTAMMETRY; FERROCENE; REDUCTION; COMPROPORTIONATION; BENZOQUINONE; OXIDATION;
D O I：
10.1016/j.jelechem.2010.12.011
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Microelectrode double potential step chronoamperometry is reported which allows the measurement of the diffusion coefficients of [Ru(NH3)(6)](3+) and [Ru(NH3)(6)](2+) in aqueous solutions containing various concentrations of the supporting electrolyte, KCl, KNO3 or K2SO4. In the case of K2SO4, ion-pairing of hexaammineruthenium cations is inferred where for KCl and KNO3 no such effects were noted. The triply charged ion was found to have a significantly lower diffusion coefficient than the doubly charged ion with a ratio of similar to 0.71 in the KCl and KNO3 media. (C) 2010 Elsevier B.V. All rights reserved.
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页码：13 / 17
页数：5
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