Ni(3)Te(2)O(2)(PO(4))(2)(OH)(4), an open-framework structure isotypic with Co(3)Te(2)O(2)(PO(4))(2)(OH)(4)

Single crystals of Ni(3)(TeO(OH)(2))(2)(PO(4))(2), trinickel(II) bis[(oxidodihydoxidotellurate(IV)] bis(phosphate),were obtained by hydro­thermal synthesis at 483 K, starting from NiCO(3)·2Ni(OH)(2), TeO(2) and H(3)PO(4) in a molar ratio of 1:2:2. The crystal structure of Ni(3)Te(2)O(2)(PO(4))(2)(OH)(4) is isotypic with that of Co(3)Te(2)O(2)(PO(4))(2)(OH)(4) [Zimmermann et al. (2011 ▸). J. Solid State Chem. 184, 3080–3084]. The asymmetric unit comprises two Ni (site symmetries [Image: see text], 2/m) one Te (m), one P (m), five O (three m, two 1) and one H (1) sites. The tellurium(IV) atom shows a coordination number of five, with the corresponding [TeO(3)(OH)(2)] polyhedron having a distorted square-pyramidal shape. The two Ni(II) atoms are both octa­hedrally coordinated but form different structural elements: one constitutes chains made up from edge-sharing [NiO(6)] octa­hedra extending parallel to [010], and the other isolated [NiO(2)(OH)(4)] octa­hedra. The two kinds of nickel/oxygen octa­hedra are connected by the [TeO(3)(OH)(2)] pyramids and the [PO(4)] tetra­hedra through edge- and corner-sharing into a three-dimensional framework structure with channels extending parallel to [010]. Hydrogen bonds of medium strength between the hy­droxy groups and one of the phosphate O atoms consolidate the packing. A qu­anti­tative structure comparison between Ni(3)Te(2)O(2)(PO(4))(2)(OH)(4) and Co(3)Te(2)O(2)(PO(4))(2)(OH)(4) is made.