Synthesis, characterization and electrochemical studies of azo dyes derived from barbituric acid

摘要

We have made an effort to synthesize three heterocyclic azo dyes 1(a-c) by means of diazotization of 6-methoxy-1,3-benzothiazol-2-amine, 4-(4-nitropheny1)-1,3-thiazol-2-amine and 6-methy1-1,3-benzothiazol-2-amine by coupling with barbituric acid with high yield in basic media (pH = 9-10). Structural confirmation of the synthesized azo dyes has been accomplished by Ultra Violet-Visible, Fourier Transform Infrared, Proton Nuclear Magnetic Resonance and Mass spectrometric techniques. The electrochemical properties of above azo dyes are investigated by cyclic voltammetric technique. The effects of scan rate and concentration of sulphuric acid was studied at glassy carbon electrode. The overall electrode process is diffusion controlled. The electrode reaction mechanism was proposed. (C) 2016 Elsevier Ltd. All rights reserved.