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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > October  >
In the Laboratory
A Cyclic Voltammetry Experiment Illustrating Redox Potentials, Equilibrium Constants, and Substitution Reactions in Coordination Chemistry
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
Cover
October 2000
Vol. 77 No. 10
p. 1351
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)(kS-DMSO)]- complex. From the electrochemistry data, the formation constants for the [RuIII(EDTA)(kS-DMSO)]- and [RuII(EDTA)(kS-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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Instructor notes are available as supplemental material.
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*  Citation
 Toma, Henrique E.; Araki, Koiti; Dovidauskas, Sergio. J. Chem. Educ. 2000 77 1351.
*  Keywords
 Coordination Chemistry; Electrochemistry; Equilibrium; Laboratory Instruction
*  History
 Created:
Last Updated:		 September 22, 2000
August 31, 2005
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