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A Cyclic Voltammetry Experiment Illustrating Redox Potentials, Equilibrium Constants, and Substitution Reactions in Coordination Chemistry

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Henrique E. Toma , Koiti Araki and Sergio Dovidauskas

Instituto de Química, Universidade de São Paulo, C. Postal 26077, CEP 05599-970 São Paulo, SP, Brazil

J. Chem. Educ., 2000, 77 (10), p 1351

DOI: 10.1021/ed077p1351

Publication Date (Web): October 1, 2000

Abstract

We report a cyclic voltammetry experiment focusing on the [Ru^III(EDTA)(H₂O)]^- complex and its equilibrium reaction with dimethyl sulfoxide (DMSO) in aqueous solution, yielding the [Ru^III(EDTA)(κS-DMSO)]^- complex. From the electrochemistry data, the formation constants for the [Ru^III(EDTA)(κS-DMSO)]^- and [Ru^II(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.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Coordination Compounds

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