Uranyl fluoride

Uranyl fluoride

Uranyl fluoride
Names
IUPAC name Uranium(VI) difluoride dioxide
Other names Difluorodioxouranium Uranium oxyfluoride Uranyl difluoride
Identifiers
CAS Number	13536-84-0  Y
3D model (JSmol)	Interactive image
ChemSpider	4937337
ECHA InfoCard	100.033.529
EC Number	236-898-8
PubChem CID	6432077
CompTox Dashboard (EPA)	DTXSID9065528
InChI InChI=1S/2FH.2O.U/h2*1H;;;/q;;;;+2/p-2 Key: KCKICANVXIVOLK-UHFFFAOYSA-L
SMILES O=[U+2]=O.[F-].[F-]
Properties
Chemical formula	UO2F2
Molar mass	308.024 g·mol−1
Appearance	yellow solid [1]
Density	6.37 g/cm3 [2]
Solubility in water	very soluble
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H300, H330, H373, H411
Related compounds
Related compounds	Uranyl bromide Uranyl chloride Uranyl iodide Neptunyl fluoride Plutonyl fluoride Plutonyl chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y  verify  (what is  YN ?) Infobox references

Uranyl fluoride is the inorganic compound with the formula UO₂F₂. It is most notable as a contaminant in the production of uranium tetrafluoride. ^[3]

As shown by X-ray crystallography, the uranyl centers UO2+2 are surrounded by six fluoride ligands F⁻. ^[4]

Synthesis

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 ^[5]

Physical properties

This salt is very soluble in water as well as hygroscopic. ^[1] 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 ]}

References

1. Perry, Dale L. (2016-04-19). Handbook of Inorganic Compounds. CRC Press. p. 448. ISBN   978-1-4398-1462-8.
2. https://ibilabs.com/uranium-uranyl-thorium-compounds/uranyl-compounds/uranyl-fluoride/
3. 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.
4. 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 .
5. 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.