Acta Cryst. (2014). E70, m6 [ doi:10.1107/S1600536813032558 ]
Abstract: In the title compound, (C5H7N2)2[Ni(H2O)6](SO4)2, the NiII cation is located on an inversion centre and is coordinated by six aqua ligands in a slightly distorted octahedral coordination environment. The [Ni(H2O)6]2+ ions are connected through an extensive network of O-HO hydrogen bonds to sulfate anions, leading to the formation of layers parallel to (001). The 4-aminopyridinium cations are located between these layers and are connected to the anionic framework by N-HO hydrogen bonds. Weak - interactions between the pyridine rings, with a centroid-centroid distance of 3.754 (9) Å, provide additional stability to the crystal packing.
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