Two supramolecular structures constructed from Keggin-type polyoxometalates and 4,4′-bipyridine
JOURNAL OF COORDINATION CHEMISTRY(2012)
摘要
Two supramolecular compounds based on Keggin-type polyoxometalates (POMs), (4,4'-H2bpy)(4,4'-Hbpy)[PMo12O40] (1) and (4,4'-H2bpy)(4,4'-Hbpy)2[SiW12O40]?.?4H2O (2), have been synthesized hydrothermally and characterized by elemental analyses, IR, UV-Vis, XPS spectra, thermogravimetric analyses, and single-crystal X-ray diffraction analyses. The two compounds consist of 4,4'-bipyridine (4,4'-bpy) ligands and different Keggin-type POMs which are [PMo12O40]3- for 1 and [SiW12O40]4- for 2. There are hydrogen-bonding interactions between the POMs, 4,4'-bipyridine, and/or water in 1 and 2. In addition, 2 contains an uncommon (H2O)2 water cluster.
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关键词
Crystal structure,Hydrothermal synthesis,Keggin polyoxometalates,Hydrogen bonds
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