Synthesis and Crystal Structure of Indium Tellurium Trioxide Bromide

Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry (Impact Factor: 0.5). 04/2009; 39(4):209-210. DOI:10.1080/15533170902858211

ABSTRACT The pale yellow air-stable compound InTeO3Br could be obtained by the reaction of In, TeO2, Te and Br2. The compound crystallizes in the monoclinic crystal system (a=8.2596 (4) Å, b = 6.8752(3) Å, c = 7.1394 (3) Å, β = 103.121 (2)^, Z = 4, space group = P21/c),[1] isotypic to the corresponding chloride compound, InTeO3Cl.[2] The compound forms a layered structure and these layers are separated by van der Waal's gaps. InO4Br2 octahedra linked with the TeO3 by sharing common corners are the typical structural building blocks for the title compound.

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    ABSTRACT: Four new layered oxyhalides related to the Sillen family have been prepared and characterized by Rietveld refinement of powder X-ray and neutron diffraction data. BiTeO3I and NdTeO3Br both adopt tetragonal symmetry, space group P4/nmm (for BiTeO3I, a=4.10811(8), c=27.988(1) Å; NdTeO3Br, a=4.06603(7), c=26.922(1) Å, at 25°C). The structures are composed of triple and double fluorite-related mixed metal oxide layers separated by single and double halogen layers, in the sequence MTe2O5XXMTe2O5XM2O2X, which may be represented by the symbol X13X13X22, where the subscript signifies the number of halogen layers and the superscript the number of metal sublayers within the fluorite block, by analogy with Sillen’s notation. The double fluorite layers are occupied exclusively by Bi, whereas there is an ordered arrangement of Bi/Te within the triple fluorite layers, with Te exclusively occupying the outer sublayers of the block. NdTeO3Cl adopts an orthorhombically distorted form of this structure type, space group Pmmn, a=4.08096(8), b=4.03441(8), c=25.7582(7) Å at 25°C. Bi5TeO8.5I2 adopts a distorted, non-centrosymmetric version of the simpler X13 structure type, space group Cmm2, a=5.6878(3), b=5.7230(3), c=9.7260(6) Å, consisting of single halogen layers sandwiched between triple fluorite layers, in which there is partial ordering of the Bi/Te cations.
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    ABSTRACT: The new oxychloride InTeO(3)Cl was synthesized from a mixture of In(2)O(3), InCl(3) and TeO(2). Its structure has been determined from single-crystal X-ray diffraction data. The structure is composed of layers separated by a van der Waals gap. The layers consist of edge-sharing chains of [InO(4)Cl(2)] octahedra linked through [TeO(3)] trigonal pyramids. No free Cl atoms are located between the layers.
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    ABSTRACT: A new layered transition metal oxohalide, FeTe2O5ClxBr1-x, has been identified. It crystallizes in the monoclinic space group P21/c. The unit cell for FeTe2O5Br is a = 13.3964(8), b = 6.5966(4), c = 14.2897(6) A, beta=108.118(6) degrees, and Z=8. The layers are built of edge sharing [FeO6] octahedra forming [Fe4O16]20- units that are linked by [Te4O10X2]6- groups. The layers have no net charge and are only weakly connected via van der Waals forces to adjacent layers. There are four crystallographically different Te atoms, and one of them displays a unique [TeO2X] coordination polyhedron (X=Cl, Br). Magnetic susceptibility measurements show a broad maximum typical for 4-spin clusters of coupled Fe(III) ions in the high-spin state. Evidence for magnetic instabilities exists at low temperatures, which have been confirmed with specific heat experiments. A theoretical modeling of the susceptibility concludes a frustration of the intra-tetramer anti-ferromagnetic exchange interaction.
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