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Single crystals of Ni 3 (TeO(OH) 2 ) 2 (PO 4 ) 2 , trinickel(II) bis[(oxidodihydoxidotellurate(IV)] bis(phosphate),were obtained by hydro-thermal 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 , 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 octa-hedrally coordinated but form different structural elements: one constitutes chains made up from edge-sharing [NiO 6 ] octa-hedra extending parallel to [010], and the other isolated [NiO 2 (OH) 4 ] octa-hedra. The two kinds of nickel/oxygen octa-hedra are connected by the [TeO 3 (OH) 2 ] pyramids and the [PO 4 ] tetra-hedra through edge- and corner-sharing into a three-dimensional framework structure with channels extending parallel to [010]. Hydrogen bonds of medium strength between the hy-droxy groups and one of the phosphate O atoms consolidate the packing. A qu-anti-tative 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.

Ni3Te2O2(PO4)2(OH)4, an open-framework structure isotypic with Co3Te2O2(PO4)2(OH)4