Reactions of cobalt(I) complexes with ammonium and sulphonium ions and organic halides
Abstract
Kinetic measurements are reported for the dealkylation reactions of ammonium and sulphonium compounds and organic halides with cobalt(I) complexes of a series of tetradentate Schiff's bases. The reaction was followed by polarography and cyclic voltammetry. The kinetics conformed to a second order rate law and pseudo-first order plots were obtained in the presence of an excess of substrate. The plot of E½ values vs. log k″ for the reaction with PhBr and EtBr and [Me2SC6H4Me]+ shows a linear free energy relationship suggesting a simple SN2 displacement reaction and confirming that the nucleophilicity of cobalt(I) species is influenced by the nature of the chelating ligands.