Abstract
A novel polyoxometalate-based organic-inorganic polymer [{Ca(DMF) 5 } 2 SiMo 12 O 40 ] n has been synthesized and characterized by elemental analysis, IR, UV and X-ray single-crystal structural analysis. The title compound crystallizes in a monocline lattice, P2 1 /n, with a =1.3379(3), b = 1.9796(4), c = 1.4574(3) nm, β = 92.24(3)°, V = 3.8568(13) nm 3 , Z = 2, R 1 = 0.083 and R w = 0.2065. The result of crystal structure analysis indicates that Ca 2+ is surrounded by seven coordination oxygen atoms with pentagonal bipyramidal geometry and bridged with terminal oxygen atom of polyanion in the structure. The compound contains an unprecedented one-dimensional linear chain built by alternate polyanions and cationic units through Mo-O d -Ca-O-Ca links in crystal. The IR spectra and X-ray crystallography analysis exhibit that there is a strong interaction between the polyanion and organic group in solid state. The electronic spectra (λ = 200—500 nm) for the title compound dissolved in the mixed solvent of acetonitrile and water indicate that it is fully dissociated. The TGA/DTA study shows three stages of weight loss and that the thermal stability of polyanion is better than that of H 4 SiMo 12 O 40 ·H 2 O.
Published Version
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