POLAROGRAPHIC BEHAVIOUR OF SOME COBALT(III) COMPLEXES WITH ETHYLENEDIAMINE

Abstract

The polarographic behaviour of various cobalt(III)-amine complexes with ethylenediamine were studied in Britton-Robinson buffer solutions and also in the presence of 1,2-cyclohexane dione dioxime. It was observed that the cobalt(III)-amine complexes, generally, are reduced in two steps. The first wave (Co(III) -> Co(II)) has an irreversible character, the second one corresponds rather to a Co(II)-ligand -> Co(0) step, than to a . [Co(H20)6]2+ -> Co(0) reduction, as presumed earlier. In the presence of dioximes the hexamine and monoacidopentamine type cobalt(llI) complexes do not undergo substitution reactions under the above mentioned experimental conditions.