catena-Poly[[[diaquabis(2-methyl-6-oxo-1,6-dihydro-3,4′-bipyridine-5-carbonitrile)copper(II)]-μ-sulfato] tetrahydrate]

Abstract

In the title polymer, {[Cu(SO4)(C12H9N3O)2(H2O)2]·4H2O}n, both the metal center and the sulfate anion are located on a twofold axis. The CuII ion is coordinated by two pyridyl N atoms from two symmetry-related organic ligands, two O atoms from two symmetry-related water molecules, and two O atoms from two symmetry-related sulfate anions, resulting in a distorted octahedral geometry. The sulfate anions act as μ2-bridges and connect metal ions, forming a one-dimensional chain along the b axis. The three-dimensional crystal structure is established through intermolecular N—H...O and O—H...O hydrogen bonds involving the organic ligands, sulfate anions, coordinated and uncoordinated water molecules, and through π–π interacting 2-pyridone rings, with centroid–centroid separations of ca 3.96 Å and tilt angles of ca 2.62°.