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Syntheses, crystal structures, and properties of two molecular double-supporting polyoxotungstates

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Abstract

Two molecular double-supporting polyoxotungstates [SiW12O40{M(phen)2H2O}2] · nH2O (phen = 1,10′-phenanthroline, M = Mn 1, n = 2; M = Co 2, n = 3) were synthesized hydrothermally and characterized by elemental analyses, IR, TG, and X-ray single-crystal diffraction. The variable-temperature magnetic susceptibilities were measured at 2–300 K. The double-supporting polyoxotungstate molecule consists of a Keggin-type dodecatungstosilicate anion and a pair of transition metal complex fragments which are covalently linked to opposite sides of the Keggin anion. The transition metal ion locates in the center of a distorted octahedron. Multiple H-bonding interactions are observed between the coordinated waters of the transition metal complex fragments and terminal oxygen atoms of Keggin units and also between the bridging oxygen atoms of Keggin units and the lattice waters, which creates one-dimensional chains or two-dimensional layers. Between the layers or chains there are weak CH···O hydrogen bonding interactions and van der Waals forces. The molecular double-supporting polyoxotungstosilicate begins to decompose at ca. 500 °C. The variable-temperature magnetic behavior of 1 shows weak antiferromagnetic characteristics with a small value of θ = −0.289 K.

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Acknowledgment

This work was supported by Analysis and Testing Foundation of Northeast Normal University.

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Authors and Affiliations

  1. Key Laboratory of Polyoxometalates Science of Ministry of Education, College of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun, 130024, P.R. China

    Sheng Lu, Fan-Xia Meng, Dong-Mei Shi & Ya-Guang Chen

  2. College of Material Science and Chemistry Engineering, Eastern Liaoning University, Dandong, 118003, P.R. China

    Sheng Lu

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  1. Sheng Lu
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  2. Fan-Xia Meng
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  3. Dong-Mei Shi
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  4. Ya-Guang Chen
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Correspondence to Ya-Guang Chen.

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Lu, S., Meng, FX., Shi, DM. et al. Syntheses, crystal structures, and properties of two molecular double-supporting polyoxotungstates. Transition Met Chem 33, 353–359 (2008). https://doi.org/10.1007/s11243-007-9048-5

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  • DOI: https://doi.org/10.1007/s11243-007-9048-5

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