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—H⋯O hydrogen bonds between coordinated or uncoordinated water molecules and O atoms that are part of the helices.
Highlights
The title borophosphate LiNi(H2O)2[BP2O8]H2O was synthesized under hydrothermal conditions
The ribbons are connected via Ni2+ cations that are located on twofold rotation axes
A review on the structural chemistry of borophosphates is given by Ewald et al (2007)
Summary
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 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. Li+ cations, likewise located on twofold rotation axes, in an irregular environment of five O atoms. The structure is stabilized by O—H O hydrogen bonds between coordinated or uncoordinated water molecules and O atoms that are part of the helices. Symmetry codes: (i) x þ 1; x þ y þ 1; z þ 13; (ii) x; x y; z þ 56; (iii) y; x; z þ 23;. Symmetry codes: (iv) y þ 1; x y; z 13; (vi) x y; y; z
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