Crystal structure of bis(dimethylammonium) hexaaquanickel(II) bis(sulfate) dihydrate
2014
In the title salt, (C2H8N)2[Ni(H2O)6)](SO4)2·2H2O, the NiII cation is located on a centre of inversion and exhibits a slightly distorted octahedral arrangement of water molecules. The Ni—O bond lengths in the complex [Ni(H2O)6]2+ cation show a distribution as in the related Tutton salt (NH4)2[Ni(H2O)6](SO4)2, but are longer in average [2.056 (13) versus 2.037 (12) A]. The noncoordinating water molecules and dimethylammonium cations connect the sulfate and [Ni(H2O)6]2+ octahedra via O—H⋯O and N—H⋯O hydrogen bonds from weak up to medium strength into a three-dimensional framework whereby the complex metal cations and sulfate anions are arranged in sheets parallel (001).
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