Polarographic, linear-sweep cyclic voltammetric and coulometric at controlled potential studies of some 2,5-dihydro-1,3,4-thiadiazoles ( 3-1,3,4-thiadiazolines) on mercury electrodes have been performed in acetonitrile over pH range 1.2-13 in water-ethanol and water-acetonitrile mixtures with Britton-Robinson's buffer. Under conditions of present study, thiadiazoles are reduced to respective thiadiazolidines, and the N=N bond is reduced faster than the C=O group. All electrochemical reactions at pH < 7 are pH dependent and at pH > 7 influenced by surface characteristics. Electrode reaction mechanisms are presented and discussed.
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