Spectroscopic and Structural Studies of 2, 4-dihydro-[1, 2, 4]-triazol-3-one Derivatives and X-ray Crystal Structures of 4-(3-phenylallylideneamino)-5- thiophen-2-yl-methyl-2, 4-dihydro-[1, 2, 4]triazol-3-one

Abstract

The tetradentate ligand, 6,6′-bis(N-methylhydrazine)-2,2′- bipyridine (L) and its mononuclear copper(II) complex [Cu(L)](ClO <inf>4</inf>)<inf>2</inf>] (1) have been synthesized and characterized. The crystal structures of L and 1 have been determined by single-crystal X-ray diffraction. Both crystallize in the centrosymmetric monoclinic space group with crystallographic inversion symmetry. The ligand adopts a planar transoid configuration in the solid state. In 1, the Cu(II) is six-coordinate octahedral, defined by N<inf>4</inf>O<inf>2</inf> donors from ligand and two perchlorates. The molecular units are connected by intermolecular H-bonds between the hydrazino group of the one unit and coordinated perchlorate of the neighboring two units via N-H⋯O to furnish a 2-D network. Coordinated perchlorates also form an intramolecular H-bond with hydrazine influencing the crystal packing. © 2010 Taylor & Francis.