Synthesis, Structure And Properties Of Rare-earth And Transition-metal Derivatives Of Molybdenum Tellurate

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)å’Œ{[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.