Acta Cryst. (2012). E68, i62-i63
[ doi:10.1107/S1600536812029960 ]

Dilithium disodium nickel(II) cyclohexaphosphate dodecahydrate, Li₂Na₂NiP₆O₁₈·12H₂O

S. Abid, S. S. Al-Deyab and M. Rzaigui

Abstract: The crystal structure of Li₂Na₂NiP₆O₁₈·12H₂O is characterized by the presence of six-membered P₆O₁₈^6- phosphate ring anions (internal symmetry -1) having a chair conformation and three different cations, viz. Li⁺, Na⁺ and Ni²⁺, to counterbalance the anionic charge. All atoms are in general positions except for nickel, which lies on a special position with site symmetry 2. Lithium has a tetrahedral environment (LiO₄), and sodium and nickel have octahedral environments [NaO₆ and Ni(H₂O)₆, respectively]. The P₆O₁₈ rings are linked via corner sharing by NaO₆ octahedra and LiO₄ tetrahedra to form a three-dimensional framework presenting tunnels running along [010] in which the six-coordinated Ni²⁺ cations are located. The structure is stabilized by a network of O-HO hydrogen bonds.

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