catena-Poly[[aquabis[N-(pyridin-3-yl)isonicotinamide-κN1]copper(II)]-μ-fumarato-κ2O1:O4]

Abstract

In the title compound, [Cu(C4H2O4)(C11H9N3O)2(H2O)]n, CuII ions on crystallographic twofold rotation axes are coordinated in a square pyramidal environment by two trans O atoms belonging to two monodentate fumarate anions, two trans isonicotinamide pyridyl N-donor atoms from monodentate, pendant 3-pyridylisonicotinamide (3-pina) ligands, and one apical aqua ligand, also sited on the crystallographic twofold rotation axis. The exobidentate fumarate ligands form [Cu(fumarate)(3-pina)2(H2O)]n coordination polymer chains that are arranged parallel to [001]. In the crystal, these polymeric chains are anchored into supramolecular layers parallel to (100) by O—H...O hydrogen bonds between aqua ligands and unligating fumarate O atoms, and N—H...O(=C) hydrogen bonds between 3-pina ligands. In turn, the layers aggregate by weak C—H...N and C—H...O hydrogen bonds, affording a three-dimensional network.