Syntheses and characterization of novel three-dimensional tellurites, Na{sub 2}MTe{sub 4}O{sub 12} (M = W, Mo), with intersecting tunnels
Two isostructural tellurium-rich tellurites, Na{sub 2}WTe{sub 4}O{sub 12} (1) and Na{sub 2}MoTe{sub 4}O{sub 12} (2), have been synthesized and structurally characterized by single-crystal X-ray diffraction studies. Three types of polyhedra, namely, MO{sub 6} octahedra, TeO{sub 3} pyramids, and TeO{sub 5} square-pyramids, constitute the three-dimensional (MTe{sub 4}O{sub 12}){sup 2{minus}} (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) {angstrom}, b = 5.7755(10) {angstrom}, c = 11.269(3) {angstrom}, {beta} = 104.33(2){degree}; for 2, a = 17.341(4) {angstrom}, b = 5.8262(11) {angstrom}, c = 11.268(2) {angstrom}, {beta} = 104.38(2){degree}. Syntheses and structure, powder X-ray diffraction, and infrared spectroscopic studies of these compounds are described.
- Research Organization:
- Indian Inst. of Tech., Madras, Chennai (IN)
- OSTI ID:
- 20013077
- Journal Information:
- Inorganic Chemistry, Vol. 38, Issue 25; Other Information: PBD: 13 Dec 1999; ISSN 0020-1669
- Country of Publication:
- United States
- Language:
- English
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