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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 [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—H...O hydrogen bonds.

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The title compound, (C3H12N2)[Cr2O7], consists of a discrete dichromate anion with an eclipsed conformation and a propane-1,3-diammonium cation. Both kinds of ions have a mirror plane passing through the bridging O atom and the central methyl­ene C atom of the Cr2O72− and C3H12N22+ moieties, respectively. Anions and cations are alternately stacked to form columns parallel to the b axis. Ions are linked by intra- and inter-column hydrogen bonds of types N—H...O and C—H...O, involving O atoms of the dichromate anions as acceptors, and ammonium or methyl­ene groups as donors.

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In the title hydrated mol­ecular salt, 2C4H16N33+·P6O186−·2H2O, the complete cyclo­hexa­phosphate anion is generated by crystallographic inversion symmetry. The six P atoms of the P6O186− anion form a chair conformation and the organic cation has a corrugated linear geometry. In the crystal, the cations and the anions are connected by N—H...O hydrogen bonds into slabs propagating in the ac plane. The water mol­ecules link the slabs by accepting N—H...O links and forming O—H...O links. The triclinic polymorph was reported by Gharbi et al. [(1995). J. Solid State Chem. 114, 42–51].
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