Abstract
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.
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