Acta Cryst. (2008). E64, m1440-m1441  [ doi:10.1107/S1600536808033278 ]

Tris(oxamide dioxime-²N,N')nickel(II) sulfate pentahydrate

M. M. Belombe, J. Nenwa, Y. A. Mbiangue, B. P. T. Fokwa and R. Dronskowski

Abstract: The asymmetric unit of the title compound, [Ni(C₂H₆N₄O₂)₃]SO₄·5H₂O, contains two complex cations, two sulfate anions and ten lattice water molecules. In both independent cations, the central Ni^II ion adopts a distorted octahedral coordination involving six imino N atoms of three bidentate oxamide dioxime ligands. The bulk structure is achieved by a three-dimensional network of O-HO and N-HO hydrogen bonds which interlink the ionic partners and some water molecules in such a manner that the lattice framework thus formed defines channels parallel to [100]. The other water molecules are lodged inside these channels. Two of the ten water molecules in the asymmetric unit are disordered over three sites, in 0.356 (3):0.324 (5):0.320 (5) and 0.247 (3):0.293 (6):0.460 (6) occupancy ratios, and one O atom of a sulfate ion is also disordered over two sites, with occupancies of 0.621 (5) and 0.379 (5).

Online 18 October 2008

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