Crystal structure, vibrational studies and optical properties of a new molybdo-tellurate Na6(TeMo6O24)(H2SO4)2·12H2O
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Single crystals of a new molybdo-tellurate compound Na6(TeMo6O24)·(H2SO4)2·12H2O(I) were grown by the low-evaporation technique and characterized by X-ray diffraction, infrared absorption and UV–Vis absorption. The compound crystallizes in the monoclinic system and C2/m space group with a = 16.431(1) Å, b = 12.493(1) Å, c = 10.329(1) Å, β = 109.55(1), V = 1998.1(2) Å3, Z = 2, R = 0. 0.0395 and wR (F2) = 0.090 for 1890 unique observed reflections [I > 2 s(I)]. The crystal structures exhibit three-dimensional supramolecular assembly based on the extensive hydrogen bonding interactions between H2SO4 molecule, sodium cations, water molecules and Anderson polyoxoanions (TeMo6O24)6−. The infrared spectrum fully confirms the X-ray crystal structure, and the UV spectrum of the title compound exhibits an absorption peak at 220 nm.
KeywordsPolyoxometalates Clusters X-ray diffraction Three-dimensional structures Infrared
This work was supported by the Ministry of Higher Education and Scientific Research of Tunisia. We are very grateful to Yaroslav Filin chuk from UCL who for the revision of English.
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