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

Abstract

The crystal structure of Li2Na2NiP6O18·12H2O is characterized by the presence of six-membered P6O186−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 [NaO6and Ni(H2O)6, respectively]. The P6O18rings are linkedviacorner sharing by NaO6octahedra and LiO4tetrahedra 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—H...O hydrogen bonds.