Synthesis, Structure, and Characterization of Novel Two- and Three-Dimensional Vanadates: Ba<sub>2.5</sub>(VO<sub>2</sub>)<sub>3</sub>(SeO<sub>3</sub>)<sub>4</sub>·H<sub>2</sub>O and La(VO<sub>2</sub>)<sub>3</sub>(TeO<sub>6</sub>)·3H<sub>2</sub>O
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Two new vanadates, Ba2.5(VO2)3(SeO3)4·H2O and La(VO2)3(TeO6)·3H2O, have been synthesized by hydrothermal methods using BaCO3, Ba(OH)2·H2O, La(NO3)3·6H2O, V2O5, TeO2, and H2SeO3 as reagents. The structures were determined by single-crystal X-ray diffraction. Ba2.5(VO2)3(SeO3)4·H2O exhibits a two-dimensional layered structure consisting of VO5 square pyramids and SeO3 polyhedra, whereas La(VO2)3(TeO6)·3H2O has a three-dimensional framework structure composed of VO4 tetrahedra and TeO6 octahedra. Infrared and Raman spectroscopy, UV−vis diffuse reflectance spectroscopy, and thermogravimetric analysis are also presented. Crystal data: Ba2.5(VO2)3(SeO3)4·H2O, trigonal, space group P3̄ (No. 147) with a = b = 12.8279(15) Å, c = 7.2631(9) Å, V = 1035.1(2) Å3, and Z = 2; La(VO2)3(TeO6)·3H2O, trigonal, space group R3c (No. 161) with a = b = 9.4577(16) Å, c = 23.455(7) Å, V = 1816.9(7) Å3, and Z = 6.
