Synthesis, Characterization, and Electrochemical Adsorption Study on Mercury Electrode of New Ternary Cu(II) Complexes of N‐Naphthylideneamino Acids with Imidazoles

Abstract

A new series of Cu(II) complexes of naphthylideneamino acid Schiff bases (H₂naph:aa) as a primary ligand and imidazole or 2‐methylimidazole (B) as a secondary ligand has been synthesized and characterized. The analytical data and physical characterization have proved that the complexes are four‐coordinate with the general formula [Cu(II)(naph:aa)B]. The structure of the complexes is suggested to be square‐planar. The adsorption of the formed complexes on a hanging mercury drop electrode (HMDE) was performed in 0.1 mol dm⁻³ KCl solution utilizing cyclic voltammetric and chronocoulometric techniques. The results indicate that an adsorption of copper(II) adducts occurs on the mercury electrode and the amount adsorbed expressed as excess surface coverage, Γ, was determined. The values of Γ calculated chronocoulometrically are almost the same as those calculated by cyclic voltammetry.

Keywords:

• Naphthylideneamino acid
• Primary ligand
• Schiff bases
• Cu(II) complex
• Adsorption
• Cyclic voltammetry
• Chronocoulometry