Syntheses,Crystal Structures and Properties of Two New Transition-Metal-Centered Heteropolytungstates |
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Authors: | Zhan-Gang Han Qing-Hua Hao Yan-Na Wang Jing-Jing Wu Xue-Liang Zhai |
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Institution: | (1) College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang, Hebei, 050016, People’s Republic of China |
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Abstract: | Two one-dimensional transition-metal-centered polyoxotungstates, that is, Cu(en)2]Cu(en)2(H2O)]Cu(en)(phen)]CuW12O40]·3H2O (1) (en = ethylenediamine, phen = phenanthroline) and Cu(en)2]2Cu(en)2(H2O)]2V5.8W7.2O40(VO)4]·3H2O (2) have been synthesized hydrothermally and structurally characterized by elemental analyses, IR spectroscopy, electrochemical
analysis, thermogravimetric analysis and X-ray single crystal diffraction. Single-crystal structural analysis reveals that
both of them represent one-dimensional structures constructed from transition-metal-centered Keggin-type polyanions bridged
by secondary metal coordination groups of Cu-ligand. Noticeably, compound 1 exhibits a helical chain-liked structure, and the anion is coordinated by three Cu-ligand units, representing a copper-centered
and tri-supported Keggin structure. In compound 2, the polyoxoanion V5.8W7.2O40(VO)4]8− represents a V-centered tetra-capped pseudo-Keggin structure, and is coordinated by four Cu-ligand units. The three-dimensional
supramolecular structures of compounds 1 and 2 are constructed through intermolecular hydrogen bonding interactions. The electrochemical and thermalstable properties of
1 and 2 are also studied. The results show the redox properties of polyoxotungstates are retained in title polymers. |
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