Naslov
Electrochemical reduction of Rh(bpy)(3+)(3) at Hg/phosphate electrolyte interface

Autori
Mandić, Zoran ; Gašparović, Blaženka ; Weitner, Zlatko

Izvornik
Journal of electroanalytical chemistry (1992) (1572-6657) 587 (2006), 2; 314-322

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
tris(2 ; 2'-bipyridine)rhodium(III) ; cyclic voltammetry ; mixed Hg-Rh complex ; electroreduction ; condensed layer formation

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

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