Hydrothermal synthetic investigations to prepare new A(2)Mo(3)TeO(12) (A = NH(4), Cs, Rb, K) compounds are described. Novel noncentrosymmetric layered tellurites, (NH(4))(2)Mo(3)TeO(12) (1) and Cs(2)Mo(3)TeO(12) (2), have been synthesized by hydrothermal methods. Their structures contain two-dimensional hexagonal tungsten oxide related (Mo(3)TeO(12))(2)(-) anionic layers interleaved with NH(4)(+)/Cs(+) ions. New "zero-dimensional" tellurites, Rb(4)Mo(6)Te(2)O(24).6H(2)O (3) and K(4)Mo(6)Te(2)O(24).6H(2)O (4), containing discrete centrosymmetric (Mo(6)Te(2)O(24))(4)(-) anionic aggregates and alkali metal ions have been synthesized by simple refluxing of stoichiometric reactants in water. In this hexamolybdoditellurite anion, the Mo(6)O(24) flat hexagonal ring, formed from edge sharing of six MoO(6) octahedra, is capped by tellurium on both sides. The two types of anions have the same empirical formula. Cs(2)Mo(3)TeO(12) (2) could be prepared by a solid state reaction as well. All four new tellurites have been structurally characterized by single-crystal X-ray diffraction studies. Pertinent crystal, data are as follows: for 1, hexagonal space group P6(3), a = 7.332(2) Å, c = 12.028(4) Å, Z = 2; for 2, hexagonal space group P6(3), a = 7.3956(10) Å, c = 12.186(2) Å, Z = 2; for 3, monoclinic space group P2(1)/c, a = 10.0564(14) Å, b = 9.877(8) Å, c = 15.724(3) Å, beta = 109.988(11) degrees, Z = 2; for 4, monoclinic space group P2(1)/c, a = 9.878(3) Å, b = 9.724(4) Å, c = 15.301(3) Å, beta = 108.57(2) degrees, Z = 2. Low-temperature syntheses, structure, and powder X-ray diffraction, spectroscopic, and thermal studies of compounds 1-4 are described.

structure structure (solids and liquids) D 2000 -001Low-Temperature Syntheses and Characterization of Novel Layered Tellurites, A 2 Mo 3 TeO 12 (A: NH 4 , Cs), and "Zero-Dimensional" Tellurites, A 4 Mo 6 Te 2 O 24 ·6H 2 O (A: Rb, K). -Novel centrosymmetric layered tellurites (NH 4 ) 2 Mo 3 TeO 12 (space group P6 3 , Z = 2) and Cs 2 Mo 3 TeO 12 (P6 3 , Z = 2) are prepared in 87-88% yield by hydrothermal methods. New "zero-dimensional" tellurites Rb 4 Mo 6 Te 2 O 24 ·6H 2 O (space group P2 1 /c, Z = 2) and K 4 Mo 6 Te 2 O 24 ·6H 2 O (space group P2 1 /c, Z = 2) are synthesized in 70 and 50% yield, resp., by simple refluxing of the reactants in water. All tellurites are structurally characterized by single crystal XRD. -(BALRAJ, V.; VIDYASAGAR, K.; Inorg.

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A novel, two-dimensional tellurite of molybdenum(VI), (NH(4))(6)Mo(8)Te(8)O(43).H(2)O, has been isolated as single crystals in a hydrothermal reaction and characterized by single-crystal X-ray diffraction, infrared spectroscopy, and thermal analysis. Pertinent crystal data are as follows: trigonal space group P&thremacr;, a = 12.124(4) Å, c = 8.130(3) Å, Z = 1. Its strucrure consists of (Mo(8)Te(8)O(43))(6)(-) layers interleaved with ammonium ions. The novel feature of the anionic layer is that it contains two anions, discrete [Mo(2)O(7)](2)(-) anions residing in an extended framework of (Mo(6)Te(8)O(36))(4)(-) anions made by corner connection of edge-shared bi-octahedral Mo(2)O(10) units, TeO(3) pyramids, and TeO(4) units with SF(4) geometry. Its decomposition temperature is 371 degrees C.

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