Acta Cryst. (2013). E69, m347-m348 [ doi:10.1107/S1600536813014219 ]
Abstract: The title compound, [Ni(SO4)(C10H8N2)2]·2.5H2O, is a nickel(II) complex with a distorted octahedral coordination geometry. The NiII atom is bonded by two O atoms of the bidentate chelating sulfate ligand and the four N atoms of two chelating 2,2'-bipyridine ligands. The Ni-N bond lengths range from 2.059 (3) to 2.075 (3) Å and the Ni-O bond lengths are 2.098 (3) and 2.123 (3) Å. The bipyridyl ligands are both close to planar (r.m.s. deviations of 0.254 and 0.0572 Å) and are almost orthogonal, making a dihedral angle of 82.77 (1)°. In the crystal, the complex and water molecules are connected by O-HO hydrogen bonds. Interestingly, six water molecules form a chain linking two complex molecules via sulfate O atoms. There are also stacking interactions between the aromatic rings of neighbouring 2,2'-bipyridine ligands with shortest non-covalent contacts of 3.268 (6), 3.393 (6) and 3.435 (5) Å. One of the three unique water molecules shows half-occupation.
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