Voltammetric behaviour of o-nitrophenol in aqueous methanol medium at various electrodes

Department of Chemistry, University of Rajasthan, Jaipur-302 004, Rajasthan, India E-mail: sangita.uor@gmail.com Dy. Director, RCEE, Shiksha Sankul, J.L.N. Marg, Jaipur, Rajasthan, India Manuscript received 5 February 2009, revised 20 July 2009, accepted 15 September 2009 Voltammetric curves or o-nitrophenol in aqueous methanol medium for addle, basic and neutral ranges using B.R. buffer for various concentrations (0.05, 0.1, 0.15, 0.2 mM) and scan rates wen obtained. The prominent three reduction peaks corresponding to 3e- change or o-nitrophenol was characterized at 0.1 mM concentration In neutral medium at scan rate 90 mV/s. The reversibility or the reaction was also studied by the cyclic voltammetry. Constant current electrolysis of 0.02 mM o-nitrophenol in neutral medium gives o,o'-dihydroxyazobenzene at stainless steel (type 316) cathode and counter electrode or same size and material at constant current 1.8 ampere respectively, as a major product which were confirmed by spectral and chemical analysis