Nickel(II) complexes of 5-phenyl and 5-furan-1,3,4-oxadiazole-2-thiones containing ethylenediamine: synthesis, spectral and X-ray characterization

Abstract

The products obtained by the reactions of Ni(OAc)2·4H2O with Hpot (Hpot = 5-phenyl-1,3,4-oxadiazole-2-thione) and [K(H2fchc)] (potassium N′-(furan-2-carbonyl) hydrazine carbodithioate), on treatment with excess of ethylenediamine (en), gave mixed ligand complexes [Ni(pot)2(en)2] (1) and [Ni(fot)2(en)2] (2) (fot = 5-furan-(1,3,4)-oxadiazole-2-thione). These complexes have been characterized with the aid of elemental analyses, IR, magnetic susceptibility and single crystal X-ray studies. In both complexes, the heterocyclic ligand coordinates through oxadiazole nitrogen, and the ligand exists as the thione form. The complexes 1 and 2 have distorted octahedral geometries around the centrosymmetric Ni(II) center with trans oxadiazole ligands. Both complexes show extended hydrogen bonding to give a supramolecular framework.