A Vanadium Tellurate, (NH<sub>4</sub>)<sub>2</sub>[VO<sub>2</sub>]<sub>2</sub>[TeO<sub>4</sub>(OH)<sub>2</sub>], Containing Two Edge-Shared Square-Pyramidal VO<sub>5</sub> Groups
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A new ammonium vanadium tellurate, (NH4)2[VO2]2[TeO4(OH)2] (1), was hydrothermally synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectroscopy, and TG analysis. Compound 1 crystallizes in the monoclinic system, space group P21/n: a = 8.9112(18) Å, b = 15.151(3) Å, c = 15.187(3) Å, β = 97.91(3)o, V = 2030.9(7) Å3, Z = 8, R1 (I > 2σ(I)) = 0.0295, wR2 (all data) = 0.0631. The structure of 1 consists of infinite anionic chains, {[VO2]2[TeO4(OH)2]}2−, of edge-sharing VO5 square pyramids and TeO4(OH)2 octahedra. Two VO5 square pyramids are joined together by sharing their edge to form a V2O8 binuclear unit. The V2O8 and TeO4(OH)2 units are alternatively connected to each other by sharing their edges to complete infinite zigzag anionic {[VO2]2[TeO4(OH)2]}2− chains. The structure contains an extended network of O−H···O hydrogen bonds between the chains. The network of intermolecular hydrogen bonding results in layers parallel to the ab plane. Ammonium cations are hydrogen-bonded either to the oxygen atoms of the anionic chains or to each other in a complex arrangement.
