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

Journal article

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 ∼0.71 in the KCl and KNO 3 media. © 2010 Elsevier B.V. All rights reserved.

Authors: Wang, Y; Limon-Petersen, J; Compton, R

• Publication status: Published
• Journal: JOURNAL OF ELECTROANALYTICAL CHEMISTRY
• Volume: 652
• Issue: 1-2
• Pages: 13-17
• Publication date: 2011-03-01
• DOI: 10.1016/j.jelechem.2010.12.011
• ISSN: 1572-6657
• Language: English
• Keywords: Hexaammineruthenium(III); Ion-pairing; Hexaammineruthenium(II); Stokes-Einstein equation; Diffusion coefficient