Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Synthèse et caractérisation des oxypentafluorouranates(VI) NH 4 UOF 5 , KUOF 5 , RbUOF 5 et CsUOF 5

Abstract : The oxypentafluorouranates(VI) MUOF 5 , where M = NH 4 , K, Rb, Cs, have been synthetized from reaction of UOF 4 with the ammonium or corresponding alkali metal fluoride in liquid SO 2 . According to X-ray diffraction, Raman and infrared spectroscopy, and from an isomorphism with the corresponding hexafluorouranates(V) MUF 6 , two different environments around the uranium atom are observed. In CsUOF 5 the five fluorine atoms and the oxygen around the uranium result in a pseudo-octahedral surrounding whereas for the other complexes (M = NH 4 , K, Rb) each uranium is surrounded by eight light atoms forming a dodecahedron. In this structure the dodecahedra are linked together by fluorine atoms to form infinite chains. The UOF 5 − ion has been characterized by vibrational spectroscopy in the solid state. The proposed assignment, which was made with the assumption of a C 4v symmetry of the UOF 5 − ion, was confirmed by a force constant calculation. From these data and contrary to the values reported for comparable oxypentafluoroanions, the axial fluorine is found to be less ionic than the equatorial ones.
Type de document :
Article dans une revue
Liste complète des métadonnées

https://hal-unilim.archives-ouvertes.fr/hal-03648504
Contributeur : BEATRICE DERORY Connectez-vous pour contacter le contributeur
Soumis le : jeudi 21 avril 2022 - 16:05:23
Dernière modification le : vendredi 22 avril 2022 - 03:08:30

Identifiants

Collections

Citation

Philippe Joubert, Roland Bougon, Bernard Gaudreau. Synthèse et caractérisation des oxypentafluorouranates(VI) NH 4 UOF 5 , KUOF 5 , RbUOF 5 et CsUOF 5. Canadian Journal of Chemistry, NRC Research Press, 1978, 56 (14), pp.1874-1880. ⟨10.1139/v78-305⟩. ⟨hal-03648504⟩

Partager

Métriques

Consultations de la notice

4