Synthesis, crystal structure of the ammonium vanadyl oxalatophosphite and its controlled conversion into catalytic vanadyl phosphates

Abstract : An ammonium vanadyl oxalatophosphite has been synthesized by hydrothermal treatment. The formula is (NH4)2(VOHPO3)2C2O4 2·9H2O (1). The crystal structure of the compound has been determined by single crystal X-ray diffraction and solid state Nuclear Magnetic Resonance spectroscopy (NMR). Compound 1 crystallizes in triclinic symmetry with space group P−1, a = 6.3844(4) Å, b = 7.2278(4) Å, c = 9.2965(5) Å, α = 67.260(4)°, β = 72.927(4)°, γ = 85.848(3)°. The vanadium phosphite framework consists of infinite chains of corner-sharing vanadium octahedra and hydrogenophosphite tetrahedra. The oxalate groups ensure the connection between the chains. The ammonium ions and the water molecules are located between the anionic [(VO)2(HPO3)2C2O4]2 − layers. The thermal behaviour of 1 was carefully studied by combining thermogravimetric analyses, in situ X-ray diffraction and Infrared spectroscopy. The formation of given vanadyl phosphate catalysts was shown to be atmosphere-dependent of (NH4)2(VOHPO3)2C2O4 2·9H2O thermal decomposition.
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Journal of Solid State Chemistry, Elsevier, 2017, 253, pp.73--77. 〈10.1016/j.jssc.2017.05.026〉
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Contributeur : Laurent Jonchère <>
Soumis le : lundi 11 septembre 2017 - 14:51:00
Dernière modification le : jeudi 11 janvier 2018 - 06:24:35

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C. Kouvatas, V. Alonzo, T. Bataille, L. Le Polles, C. Roiland, et al.. Synthesis, crystal structure of the ammonium vanadyl oxalatophosphite and its controlled conversion into catalytic vanadyl phosphates. Journal of Solid State Chemistry, Elsevier, 2017, 253, pp.73--77. 〈10.1016/j.jssc.2017.05.026〉. 〈hal-01544467〉

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