Poly[[[Diaqua­bis(pyridine-4-carboxamide-κN)cobalt(II)]-μ2-squarato-κO:O′] Dihydrate]

Abstract

The title polymeric compound, {[Co(C<inf>4</inf>O<inf>4</inf>)(C <inf>6</inf>H<inf>6</inf>N<inf>2</inf>O)<inf>2</inf>-(H<inf>2</inf>O) <inf>2</inf>]·2H<inf>2</inf>O}<inf>n</inf>, has two crystallographically independent half-molecules in the asymmetric unit, each Co atom residing on a center of symmetry. The two polymeric chains exhibit similar coordination geometry but display differences with regard to other structural features. Each CoII center is octahedrally coordinated by two mutually trans pyridine-4-carboxamide (or isonicotinamide) ligands, two mutually trans squarate ligands and two trans aqua ligands. The crystal structure contains chains of squarate-1,3-bridged CoII ions. These chains are held together by N - H⋯O and O - H⋯O intermolecular hydrogen-bond interactions, forming an extensive three-dimensional network. © 2005 International Union of Crystallography Printed in Great Britain - all rights reserved.