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Structural study of the cesium oxypentafluorouranate (VI) CsUOF 5

Abstract : Powder samples of cesium oxypentafluorouranate(VI) were studied by both neutron diffraction and 19 F broad Une nuclear magnetic resonance.CsUOF 5 crystallises with the [Formula: see text] space group, with the parameters a = 5.41 ± 0.01 Ǻ; α = 95°34′ ± 5′. The structure, which was found to be unchanged at temperatures as low as 4.2 K, was interpreted by a statistical occupation of six-fold equivalents sites, the occupation rate being 1/6 and 5/6 for oxygen and fluorine, respectively. The nmr study showed that the disorder corresponding to this structure was of dynamic type, and that the UOF 5 − ions were in isotropical rotation. The motion is observable at temperatures as low as 223 K with a characteristic time τ equal to3 × 10 -5 s at 266 K. On the other hand, it was also shown through this nmr study that the point symmetry of the UOF 5 − ion corresponds to the C 4v group, with the axial fluorine being more covalent than the equatorial ones. Consistency of the diffraction and nmr results is discussed.
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Soumis le : mardi 25 octobre 2022 - 16:29:28
Dernière modification le : mardi 25 octobre 2022 - 16:29:28

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Philippe Joubert, Jean-Marc Weulersse, Roland Bougon, Bernard Gaudreau. Structural study of the cesium oxypentafluorouranate (VI) CsUOF 5. Canadian Journal of Chemistry, 1978, 56 (19), pp.2546-2549. ⟨10.1139/v78-417⟩. ⟨hal-03829422⟩

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