[Open access]

Acta Cryst. (2013). E69, i83
[ doi:10.1107/S1600536813030717 ]

Hexa­aqua­nickel(II) di­hydrogen hypodiphosphate

M. Gjikaj, P. Wu and N.-P. Pook

Abstract: The asymmetric unit of the title compound, [Ni(H2O)6](H2P2O6), contains one-half of the hexa­aqua­nickel(II) cation and one-half of the di­hydrogen hypodiphosphate anion. In the complex cation, the Ni2+ atom is located on an inversion center and has an octa­hedral coordination sphere. The P-P distance in the centrosymmetric anion is 2.1853 (7) Å. In the crystal, discrete [Ni(H2O)6]2+ cations and (H2P2O6)2- anions are stacked in columns parallel to the c axis and are linked into a three-dimensional network by medium-strength O-H...O hydrogen bonds.

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