A Highly Novel Dinickel Complex: A Hydrogen-Bonded Anti-Skew Carboxylate Bridge and a 2D Supramolecular Structure

Abstract

Reaction of the tridentate Schiff base ligands obtained from 2,4-dihydroxybenzaldehyde and either l-isoleucine or l-tert-leucine with Ni(NO<inf>3</inf>)<inf>2</inf> in methanol/water solution in the presence of base afforded dinickel complexes. The crystal structure of the product derived from l-tert-leucine has been determined by X-ray crystallography. The octahedrally coordinated two Ni centers were found to be bridged by a single carboxylate group in an extremely unusual non-planar fashion. A 2D supramolecular structure, constructed by infinite hydrogen-bonded complex sheets parallel to the ab-plane of the unit cell, arises from intermolecular O-H⋯O hydrogen bonds. © 2009 Elsevier B.V. All rights reserved.