POLAROGRAPHIC AND CYCLIC VOLTAMMETRIC BEHAVIOR OF SOME AZO-COMPOUNDS DERIVED FROM SULFONAMIDE IN DMF AQUEOUS-SOLUTIONS

The polarographic and cyclic voltammetric behaviour of (2-hydroxyphenylazo)-4-benzene-sulfonamide and some of its derivatives have been studied in Britton-Robinson buffer series containing 30 vol. \% of DMF. Over the entire pH range (2-12), the reduction pathway occurs through an irreversible 4-electron step corresponding to the reduction of N = N center to the amine stage. The voltammograms recorded in acidic and alkaline solution at different scan rates exhibit one or two cathodic peaks depending on the substituent and the pH of the medium. The electrode reaction mechanism was suggested, also the kinetic parameters were calculated.