Supramolecular Assemblies of Copper(II)-Pyridine Complexes with N-Donor Ligands and Clustered Water Molecules

Abstract

Four new dinuclear and polynuclear Cu(II)-pyridine-2,3-dicarboxylate complexes with N-donor ligands, [Cu<inf>2</inf>(μ-pydc)<inf>2</inf>(dmim) <inf>4</inf>]·6H<inf>2</inf>O (1), {(4-mimH)<inf>2</inf>[Cu(μ-pydc) <inf>2</inf>]·2H<inf>2</inf>O}<inf>n</inf> (2), {[Cu(μ-pydc)(eten)] ·2H<inf>2</inf>O}<inf>n</inf> (3) and {[Cu(pen) <inf>2</inf>Cu(μ<inf>3</inf>-pydc)<inf>2</inf>]·H<inf>2</inf>O} <inf>n</inf> (4) (pydcH<inf>2</inf> = pyridine-2,3-dicarboylic acid, dmim = 1,2-dimethylimidazole, 4-mim = 4-methylimidazole, eten = N,N- diethylethylenediamine and pen = 1,3-diaminopropane) have been prepared by utilizing metalloligand approach in a two-stage synthesis and characterized by elemental analysis, FT-IR spectroscopy, thermal analysis and X-ray diffraction techniques. In 1, the dinuclear units are connected each other by cyclic discrete water tetramers to form a 2D hydrogen bonded supramolecular compound, which are extended into a three-dimensional network by C-Hâ̄π interactions. In 2, the adjacent 1D chains are connected by the water cluster to form a 2D layer structure. The 2D layers of 4 are further extended into 3D supramolecular network by only weak C-Hâ̄π interaction. © 2013 Elsevier B.V. All rights reserved.