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Electrochemical Reduction of Rh(bpy)33+ at Hg/Phosphate Electrolyte Interface

Mandić, Zoran; Gašparović, Blaženka; Weitner, Zlatko (2006) Electrochemical Reduction of Rh(bpy)33+ at Hg/Phosphate Electrolyte Interface. Journal of Electroanalytical Chemistry, 587 (2). pp. 314-322. ISSN 1572-6657

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The electrochemical reduction of tris(2, 2'-bipyridine)rhodium(III), Rh(bpy)33+, in phosphate buffer solutions was investigated by cyclic voltammetry, alternating current voltammetry, chronoamperometry and exhaustive electrolysis. The cyclic voltammograms exhibit a series of sharp peaks indicating surface confined processes. The major features of the electroreduction are strong adsorption of Rh(bpy)33+, participation of mercury in the electroreduction process and the simultaneous loss of bipyridine ligand. The complex forms condensed layer in a narrow potential region around -0.8 V vs. Ag/AgCl. The chemical bond between Rh(bpy)33+ and mercury is required for the formation of binuclear complex of rhodium(II), [Rh2bpy3(H2O)Cl]3+, at the potentials about – 0.9 V. At the potential of – 1.1 V further reduction of [Rh2bpy3(H2O)Cl]3+ leads to the concomitant oxidation of the mercury electrode, resulting in a mixed Rh(I)-Hg(II) complex and elemental rhodium deposited on the electrode.

Item Type: Article
Uncontrolled Keywords: tris(2; 2'-bipyridine)rhodium(III); cyclic voltammetry; mixed Hg-Rh complex; electroreduction; condensed layer formation
Subjects: NATURAL SCIENCES > Chemistry
NATURAL SCIENCES > Chemistry > Analytic Chemistry
Divisions: Division for Marine and Enviromental Research
Depositing User: Blaženka Gašparović
Date Deposited: 22 May 2018 08:50
DOI: 10.1016/j.jelechem.2005.11.031

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