Electroreduction of some arylazothiocardbomyl - pyrazoles

The electrochemical polarographic reduction behavior of some 3, 5-dimethyl-4- arylazo-N-thiocarbomylpyrazoles has been studied in 40% DMF [v/v]. Britton-Robinson buffers reduction took place by a 2-electron diffusion-controlled process characterized by a single well-defined irreversible wave at mercury or glassy carbon electrodes over the entire pH range of study [pH = 2.3 - 11.4]. The electrochemical parameters were obtained by fitting the experimental C-V curves with theoretical ones generated by variation of parameters. Based on the results of d.c. polarography, cyclic voltammetry, coulometry, chronoamperometric and convolution techniques, a feasible reaction mechanism has been proposed