Article
A Cyclic Voltammetry Experiment Illustrating Redox Potentials, Equilibrium Constants, and Substitution Reactions in Coordination Chemistry
Abstract
We report a cyclic voltammetry experiment focusing on the [RuIII(EDTA)(H2O)]- complex and its equilibrium reaction with dimethyl sulfoxide (DMSO) in aqueous solution, yielding the [RuIII(EDTA)(κS-DMSO)]- complex. From the electrochemistry data, the formation constants for the [RuIII(EDTA)(κS-DMSO)]- and [RuII(EDTA)(κS-DMSO)]2- complexes were calculated as 2.0 mol-1 dm3 and 2.7 x 109 mol-1 dm3, respectively. The results illustrate the kinetic lability of the ruthenium(III)-EDTA complexes and the role of backbonding stabilization in ruthenium(II)-DMSO complexes. The experiment has been successfully performed in a Coordination Chemistry course, exploiting fundamental aspects of metal complexes and the applications of that important electrochemical technique.
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- Received: August 03, 2009
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