Abstract
An original vanadium (V) oxyfluoride, containing a polymeric [(H2C4O4)VO2F] n 2n− chains and diethylammonium cations, has been synthesized by slow evaporation from aqueous solutions and characterized by single-crystal X-ray diffraction and vibrational spectroscopies (IR and Raman). (Hdea)2[(H2C4O4)VO2F]·H2O (dea: diethylamine) crystallizes in the monoclinic system, space group C2/c. The structure can be described as a succession of equivalent layers perpendicular to b. The anionic [(H2C4O4)VO2F] n 2n− polymeric chain is composed of trigonal bipyramidal VO4F polyhedra and fumaric acid (H2C4O4) groups sharing O2 corners. The cohesion of the structure is provided by a network hydrogen-bonding. The IR and Raman spectra exhibit characteristic bands of all groups present in the structure. Additionally UV–Vis diffuse reflectance spectrum was recorded in order to investigate the band gap nature. The measurements show that this compound exhibit semiconducting behavior with an optical band gap of 3.51 eV.
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