Uranyl fluoride

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Uranyl fluoride
Uranyl fluoride UO2F2.PNG
Uranyl fluoride
Names
IUPAC name
Uranium(VI) difluoride dioxide
Other names
Uranyl difluoride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.529 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 236-898-8
PubChem CID
  • InChI=1S/2FH.2O.U/h2*1H;;;/q;;;;+2/p-2
    Key: KCKICANVXIVOLK-UHFFFAOYSA-L
  • O=[U+2]=O.[F-].[F-]
Properties
UO2F2
Molar mass 308.024 g·mol−1
Appearancebrilliant orange solid[ citation needed ]
Density 6.37 g/cm3 [1]
Melting point ?
Boiling point ?
very soluble
Hazards
GHS labelling:
GHS-pictogram-skull.svg GHS-pictogram-silhouette.svg GHS-pictogram-pollu.svg
Danger
H300, H330, H373, H411
Related compounds
Related compounds
Uranyl chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Uranyl fluoride is the inorganic compound with the formula UO2F2. It is most notable as a contaminant in the production of uranium tetrafluoride. [2]

As shown by X-ray crystallography, the uranyl centers UO2+2 are surrounded by six fluoride ligands F. [3]

This salt is very soluble in water as well as hygroscopic. It changes in color from brilliant orange to yellow upon hydration. Starting around 300 °C, hydrolysis by the water vapor in air becomes significant, resulting in HF fumes.[ citation needed ]

It is formed in the hydrolysis of uranium hexafluoride (UF6):

UF6 + 2 H2O → UO2F2 + 4 HF

It can also be formed in the hydrofluorination of uranium trioxide (UO3):

UO3 + 2 HF → UO2F2 + H2O [4]

References

  1. https://ibilabs.com/uranium-uranyl-thorium-compounds/uranyl-compounds/uranyl-fluoride/
  2. Peehs, Martin; Walter, Thomas; Walter, Sabine; Zemek, Martin (2007). "Uranium, Uranium Alloys, and Uranium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. doi:10.1002/14356007.a27_281.pub2. ISBN   978-3-527-30385-4.
  3. Zachariasen, W. H. (1948). "Crystal chemical studies of the 5f-series of elements. III. A study of the disorder in the crystal structure of anhydrous uranyl fluoride". Acta Crystallographica. 1 (6): 277–281. Bibcode:1948AcCry...1..277Z. doi: 10.1107/S0365110X48000764 .
  4. Jang, Harry; Louis-Jean, James; Poineau, Frederic (2023-06-20). "Synthesis and Morphological Control of UO2F2 Particulates". ACS Omega. 8 (24): 21996–22002. doi:10.1021/acsomega.3c01999. ISSN   2470-1343. PMC   10286299 . PMID   37360455.