PREPARATION AND ELECTROCHEMICAL STUDY OF A SILVER(I) COMPLEX OF A HEPTAAZA QUINQUEDENTATE MACROCYCLIC LIGAND

The quinquedentate ligand L, prepared by template condensation of bis- 6,6 ''- (alpha-methylhydrazino) 4'-phenyl-2,2': 6 '',2'-terpyridine wi th glyoxal, forms a stable crystalline complex of silver(I) [Ag(L)(H2O )(2)][PF6]. Oxidative cyclic voltammetry of this complex in acetonitri le shows a reversible one-electron oxidation wave at +0.75 V, vs a Ag/ AgBF4 reference electrode. Electrochemical oxidation by controlled pot ential electrolysis of such a solution and investigation of the oxidiz ed product by EPR and IR spectroscopy, elemental analysis and conducti vity, shows that the oxidation wave could correspond to the formation of a ligand-radical cation. (C) 1997 Elsevier Science Ltd.