CYCLIC VOLTAMMETRY OF COPPER (II) IONS AT VARIOUS PH VALUES. MONONUCLEAR COPPER (II)-DIETHYLENETRIAMINE COMPLEXES

The electrochemical behaviour of copper(II) diethylenetriamine complex species 1:1, 1:2, 1:10, 1:100 molar ratios at a various pH values was studied in aqueous solution of 1×10-3M Cu(ClO4)2.6H2O containing 0.2M NaClO4 supporting electrolyte by means of cyclic voltammetry. The cyclic parameters were calculated. The first couple Cu2+/+ showed a diffusion controlled, quasi-reversible, one electron charge transfer at glassy carbon electrode (GCE). It was observed that the cathodic peak potential at a given [Cu (II)]: [dien] molar ratio and at a given pH value shifted cathodically with increasing ligand concentration. The effects of scan rate, pH and ligand concentration were examined. A linear relationship was obtained between the cathodic peak current( Ipc1) and square root of scan rate in the range of 10 to 250mV/s with a correlation co-efficient of 0.9971