Collect. Czech. Chem. Commun. 1993, 58, 328-334

Electrochemical Study of cis-Cyanoaquobis(ethylenediamine)chromium(III) Ion and Its Adducts with Hg(II) and Ag(I)

Miroslav Rievaj, Elena Korgová and Dušan Bustin

Department of Analytical Chemistry, Slovak Technical University, 812 37 Bratislava, Slovak Republic


The paper describes voltammetric and polarographic properties of the cis-cyanoaquobis(ethylenediamine)chromium(III) complex and the kinetics of its acid hydrolysis. The reactions of this complex with Hg(II) and Ag(I) ions were studied. Formation of di- and trinuclear adducts was found. Linkage isomerisation of CN bridging group in these adducts (Cr-NC-Hg and Cr-NC-Ag) was proposed on the basis of their electrochemical properties. The kinetics of formation and decomposition of [Cr(CN)(en)2(H2O)]2+ adducts with Hg(II) and Ag(I) are described and the factors affecting them are discussed.