Tetraaqua(4,4'-dimethyl-2,2'-bipyridine-κ2 N,N')nickel(II) sulfate monohydrate: A simple molecule with an extremely complex hydrogen-bonding scheme

Abstract

The title ionic compound, [Ni(C12H12N 2)(H2O)4]SO4.H2O, is composed of an NiII cation coordinated by a chelating 4,4'-dimethyl-2,2'-bipyridine ligand via its two N atoms [mean Ni-N = 2.056 (2) Å] and by four aqua ligands [mean Ni-O = 2.073 (9) Å], the net charge being balanced by an external sulfate anion. The whole structure is stabilized by a solvent water molecule. Even though the individual constituents are rather featureless, they generate an extremely complex supramolecular structure consisting of a central hydrogen-bonded two-dimensional hydrophilic nucleus made up of complex cations, sulfate anions and coordinated and solvent water molecules, with pendant hydrophobic 4,4'-dimethyl-2,2'-bipyridine ligands which interact laterally with their neighbours via π-π interactions. The structure is compared with closely related analogues in the literature. © 2013 International Union of Crystallography.