Oxidation of 3-(3-or 4-pyridyl)-1,5-diphenylformazans in tetrazolium trichlorometallates: Structural and electrochemical investigation

On interacting pyridine-containing formazans with cobalt(II) and copper(II) chlorides the richlorometallates of the corresponding cations are isolated, the structures of which were established by X-ray structural analysis. Using data of cyclic voltamperometry a scheme is proposed for the oxidation-reduction process of converting formazans into tetrazolium cations. Dedicated to deeply respected Academician M. G. Voronkov in connection with his birthday and as a mark of gratitude for his contribution to heterocyclic chemistry __________ Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1682–1696, November, 2006.