catena-Poly[[[bis[aquanickel(II)]bis(μ-pyridine-2,6-dicarboxylato N-oxide)]-μ-1,2-di-4-pyridylethane] tetrahydrate]

Abstract

In the title compound, {[Ni2(C7H3NO5)2(C12H12N2)(H2O)2]·4H2O}n, two NiII ions, two tridentate pyridine-2,6-dicarboxylate N-oxide ligands and two coordinated water molecules form centrosymmetric dinuclear units, which are further bridged by centrosymmetric 1,2-di-4-pyridylethane ligands into polymeric chains along [210]. Each NiII ion has a distorted square-pyramidal environment, with the basal plane formed by three O [Ni—O = 1.9290 (16)–1.9588 (10) Å] and one N [Ni—N = 1.9828 (18) Å] atoms and the apical position occupied by the water molecule [Ni—O = 2.2643 (11) Å]. The water molecules are involved in the formation of O—H...O hydrogen bonds.