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Synthesis, Structure and Properties of Rare-earth and Transition-metal Derivatives of Molybdenum Tellurate

Author: LiuYing
Tutor: LiuShuXia
School: Northeast Normal University
Course: Inorganic Chemistry
Keywords: Polyoxometalate Anderson polyoxoanions Organic-inorganic hybrid hydrothermal syntheses
CLC: O611.3
Type: Master's thesis
Year: 2009
Downloads: 72
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Abstract


Utilization of hydrothermal synthesis provides seven polyoxometalate compounds that have not been reported before. These compounds are characterized by elemental analyses, IR, TG and X-ray diffraction analysis. Compounds 1-5 are a series of heteropolyoxomolybdates constructed from A-type Anderson type heteropolyoxoanion [TeMo6O24]6–. Compounds 6-7 are the organic–inorganic hybrids based on the molybdenum tellurites.Compounds 1 and 2 are two lanthanide derivatives of the A-type Anderson polyoxometalates with the formulas : {[Sm（H2O）5]2(TeMo6O24)}·6H2O （1）和{[Eu（H2O）7]2(TeMo6O24)}·5H2O （2）. Compound 1 is a 2D layer architecture constructed from polyoxoanion [TeMo6O24]6– and rare earth ions Sm3+. Compound 2 displays a 1D chain structure constructed from alternating polyoxoanions [TeMo6O24]6– and rare-earth ions Eu3+ along the c axis. Luminescence measurement reveals that 2 exhibits typical red fluorescent emission of the Eu3+ ion at room temperature.Compounds 3 to 5 are the organic–inorganic hybrid compounds based on the Anderson-type polyoxometalates [TeMo6O24]6–. [（H2O）2Co(TeMo6O24)][（C10N2H10）2]·9.5H2O （3）, [(C10N2H9)Ni（H2O）3]2[TeMo6O24]·8.5H2O （4）, and （C10N2H10）3[TeMo6O24]·2H2O （5） Compound 1 displays a 1D chain structure constructed from alternating polyoxoanions [TeMo6O24]6– and Co2+ along the a axis with two pendant ligands 4,4’-bipy. Compound 2 shows a discrete structure in zigzag form. Compound 3 is a supramolecular architecture based on 4,4′-bpy units and polyoxoanions [TeMo6O24]6–.Compounds 6 and 7 are two novel organic–inorganic hybrids based on the molybdenum tellurites synthesized under the hydrothermal condition, [Cu2（bpy）2][Te2Mo6O24] （6） and [Ni2（bpy）2][Te2Mo6O24] （7） （bpy = 2,2′-bipyridine）. They are isomorphic and exhibit a novel 1D chain structure constructed from molybdenum tellurite ribbon bridged by metal-bpy complex moieties.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Chemical elements and inorganic compounds > Nature
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