A Cyclic Voltammetric Studies of Complexation of Copper (II) with Thymine Using Glassy Carbon Electrode in Aqueous Medium

Abstract

Voltammetric behaviors of copper (II) complex with nitrogen bearing nucleobase, thymine (C₅H₆N₂O₂), was studied using cyclic voltammetry (CV) on a glassy carbon electrode. Assessment of the chemical and physical conditions that may favor optimum current enhancement was done by studying the effect of variation of concentration of metal and ligand ions, scan rate, step height, pH values and supporting electrolyte as (NH₄)₂SO₄, KCl and NaCl. It was observed that copper and thymine forms a 1:1 ratio complex and increasing the concentration of either metal ion or ligand ion increases the corresponding current. Increasing the scan rate increases the corresponding current linearly with the square root of the scan rate. As the step height decreases the peaks become sharper. Anodic and cathodic current increases linearly with decreasing step height. The highest degree of complexation was observed at pH ranging from 2.3 to 7.0. However, poor complexation was observed in slightly alkaline medium. The complexing order trend of supporting electrolytes was observed as (NH₄)₂SO₄>NaCl>KCl.