Vidyavathy, K. Vidyasagar
Nov 23, 1999
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0
Influential Citations
39
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Journal
Inorganic Chemistry
Abstract
Two isostructural tellurium-rich tellurites, Na2WTe4O12 (1) and Na2MoTe4O12 (2), have been synthesized and structurally characterized by single-crystal X-ray diffraction studies. Three types of polyhedra, namely, MO6 octahedra, TeO3 pyramids, and TeO5 square-pyramids, constitute the three-dimensional (MTe4O12)2- (M = W, Mo) anionic framework, which contains different types of intersecting tunnels, one of them being novel spiral pseudohexagonal tunnels occupied by sodium ions. Both compounds have the monoclinic space group C2/c, with Z = 4. The lattice parameters are as follows: for 1, a = 17.348(3) A, b = 5.7755(10) A, c = 11.269(3) A, β = 104.33(2)°; for 2, a = 17.341(4) A, b = 5.8262(11) A, c = 11.268(2) A, β = 104.38(2)°. Syntheses and structure, powder X-ray diffraction, and infrared spectroscopic studies of these compounds are described.