Inorganic Chemistry, Vol.45, No.9, 3602-3605, 2006
Synthesis, structure, and characterization of novel two- and three-dimensional vanadates: Ba-2.5(VO2)(3)(SeO3)(4)center dot H2O and La(VO2)(3)(TeO6)center dot 3H(2)O
Two new vanadates, Ba-2,Ba-5(VO2)(3)(SeO3)(4)(H2O)-H-. and La(VO2)(3)(TeO6)(.)3H(2)O, have been synthesized by hydrothermal methods using BaCO3, Ba(OH)(2)-H2O, La(NO3)(3)(.)6H(2)O, V2O5, TeO2, and H2SeO3 as reagents. The structures were determined by single-crystal X-ray diffraction. Ba-2.5(VO2)(3)(SeO3)(4)(H2O)-H-. exhibits a two-dimensional layered structure consisting of VO5 square pyramids and SeO3 Polyhedra, whereas La(VO2)3(TeO6)-3H(2)O 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: Ba-2.5(VO2)(3-)(SeO3)(4)(.) H2O, trigonal, space group P (K) over bar (No. 147) with a = b = 12.8279(15) angstrom, c = 7.2631 (9) angstrom, V = 1035.1(2) angstrom(3), and Z = 2; La(VO2)(3)(TeO6)(.)3H(2)O, trigonal, space group R3c (No. 161) with a = b = 9.4577(16) angstrom, c 23.455(7) angstrom, V = 1816.9(7) angstrom(3), and Z = 6.