Acta Cryst. (2009). E65, i42  [ doi:10.1107/S1600536809014652 ]

Lithium diaquanickel(II) catena-borodiphosphate(V) monohydrate

J. Zheng and A. Zhang

Abstract: The title borophosphate LiNi(H₂O)₂[BP₂O₈]·H₂O was synthesized under hydrothermal conditions. The crystal structure is isotypic with the Mg analogue and features helical [BP₂O₈]^3- borophosphate ribbons, constructed by BO₄ (2 symmetry) and PO₄ tetrahedra. The borate groups share all their oxygen apices with adjacent phosphate tetrahedra. The ribbons are connected via Ni²⁺ cations that are located on twofold rotation axes. The cations have a slightly distorted octahedral oxygen coordination by four O atoms from the anion and by two water molecules. The voids within the helices are occupied by Li⁺ cations, likewise located on twofold rotation axes, in an irregular environment of five O atoms. The structure is stabilized by O-HO hydrogen bonds between coordinated or uncoordinated water molecules and O atoms that are part of the helices.

Online 7 May 2009

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