Abstract
In the title salt, (C2H8N)2[Ni(H2O)6)](SO4)2·2H2O, the Ni(II) cation is located on a centre of inversion and exhibits a slightly distorted octa-hedral arrangement of water mol-ecules. 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) Å]. The noncoordinating water mol-ecules and di-methyl-ammonium cations connect the sulfate and [Ni(H2O)6](2+) octa-hedra 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).
Highlights
In the title salt, (C2H8N)2[Ni(H2O)6)](SO4)22H2O, the NiII cation is located on a centre of inversion and exhibits a slightly distorted octahedral arrangement of water molecules
[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)
[NH2(CH3)]+ cation, one Ni2+ cation situated on an inversion centre (Wyckoff position 4a), one SO42 anion and four water molecules, one of which is not coordinating to the metal cation (Fig. 1)
Summary
In the course of a systematic search for new ‘double salts’ of simple secondary amines and divalent cations of various inorganic acids, the structure of [(CH3)2NH2][Cu(HSO4)(SO4)(H2O)4] has been described previously (Held, 2014). In continuation of these studies, copper(II) was replaced by nickel(II), yielding crystals of the title compound with composition (C2H8N)2[Ni(H2O)6)](SO4)22H2O
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