Electrochemical investigations on some 1-carboxymethylpyridinium-3-aminophenyl-5-methyl-4-[ 4' -sulfonamoyl]azopyrazoles

School of Studies in Chemistry, Jiwaji University, Gwalior-474 Oil, India E-mail : gwlsosmica@sancharnet.in Fax : 91-0751-2346209 Manuscript received 31 March 2000, revised 26 April 2002, accepted 6 September 2002 The electrochemical behavior of 1-carboxymethylpyridinium-3-aminophenyl-5-methyl-4-[ 4' -sulfonamoyl]azopyrazoles has been studied on the basis of d.c. polarography, cyclic voltammetry and coulometry in Britton-Robinson buffers in the pH range 2.5-12.0. The electroreduction occurs in a single, well defined, 2e step at dropping mercury electrode. At glassy carbon electrode also one 2e cathodic peak is observed. The electrode process is diffusion-controlled and irreversible in nature. A reaction mechanism has been postulated. The effects of ionic strength, cations, anions and solvent composition have also been evaluated