Dilithium disodium nickel(II) cyclo-hexa-phosphate dodeca-hydrate, Li 2Na2NiP6O18·12H2O

Abstract

The crystal structure of Li2Na2NiP6O 18·12H2O is characterized by the presence of six-membered P6O18 6- phosphate ring anions (inter-nal 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 tetra-hedral environment (LiO4), and sodium and nickel have octa-hedral environments [NaO6 and Ni(H2O)6, respectively]. The P6O18 rings are linked via corner sharing by NaO6 octa-hedra and LiO4 tetra-hedra 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.