Abstract
The electrochemical behaviour in DMF of sulphapyridine and its N 1-methyl derivative was studied by means of polarographic, coulometric and cyclic voltammetric methods. Polarographic analysis pointed out the effect of the adsorption on the reduction mechanism and allowed to settle the range of concentration and dropping time in which E 1 2 is only determined by the electron transfer; in these conditions E 1 2 may be regarded as a structural parameter, so that a value of σ 1 related to the effect of the pyridinil group on the reactive site was determined. Coulometric measurements let the reduction products be characterized, the overall reduction mechanism came out quite similar to that of other benzenesulphonamide derivatives. Moreover, the cyclic voltammetric behaviour showed that the reduction is affected also by the adsorption of the reduction products on the electrode surface.
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