Collect. Czech. Chem. Commun. 1983, 48, 544-549

The reduction of cobalt (II) ion in thiocyanate media by pulse polarography

Jorge Alfredo Bolzan and Robert Tokoro

Instituto de Investigationes Fisicoquimicas Teoreticas y Aplicadas, Universidad Nacional de la Plata, 1900 La Plata, Argentina


The electroreduction of cobalt(II) in aqueous thiocyanate solutions at the dropping mercury electrode depends on the thiocyanate concentration. At [SCN-] = 0.3 mol/l the intermediate cobalt(I)-thiocyanate complex does exist electrokinetically and may be responsible for the appearance of a peaked catalytic wave. The predecessor species of this intermediate may be CoSCN+ and Co(SCN)2 in similarity to the behaviour of cobalt(II) with cyanide and azide ions.