INORGANIC ARCHITECTURE BASED ON A {[Ca(H2O)]6[P4W6O34]2}12- BUILDING BLOCK: COUNTERCATION EFFECT ON THE LATTICE SYMMETRY
M.A. AlDamen, S.B. Atta, S.F. Haddad
University of Jordan, Amman, Jordan
Keywords: sandwich polyoxometalates, calcium, crystal structure, cation effect, 3D inorganic lattice
Abstract
Three new salts of the {[Ca(H2O)]6[P4W6O34]2}12- polyanion, namely (NH4)12{[Ca(H2O)]6××[P4W6O34]2}×24H2O (1), H2[Na(H2O)1.6]10{[Ca(H2O)]6[P4W6O34]2}×10H2O (2), and [Ca(H2O)5]6{[Ca(H2O)]6[P4W6O34]2}×11H2O (3) are prepared. The change in the lattice as a function of the countercation and its coordination, specially calcium, is investigated. Full characterization is made by single crystal X-ray diffraction and also UV-visible spectroscopy, FT-IR, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS).
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