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

The title borophosphate LiNi(H(2)O)(2)[BP(2)O(8)]·H(2)O was synthesized under hydro­thermal conditions. The crystal structure is isotypic with the Mg analogue and features helical [BP(2)O(8)](3−) borophosphate ribbons, constructed by BO(4) (2 symmetry) and PO(4) tetra­hedra. The borate groups share all their oxygen apices with adjacent phosphate tetra­hedra. The ribbons are connected via Ni(2+) 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.