Uranyl fluoride

Uranyl fluoride
Names
	IUPAC name Uranium(VI) difluoride dioxide
	Other names Uranyl difluoride
Identifiers
CAS Number	13536-84-0 ;
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	brilliant orange solid
Density	6.37 g/cm3
Melting point	Decomposes @ 300 °C
Boiling point	Sublimes
Solubility in water	very soluble
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	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). verify (what is ?) 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.^[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 after reacting with water. Uranyl fluoride is stable in air up to 300 °C, above which slow decomposition to U₃O₈ occurs. When heated to decomposition, UO₂F₂ emits toxic hydrofluoric acid fumes.

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

^ https://ibilabs.com/uranium-uranyl-thorium-compounds/uranyl-compounds/uranyl-fluoride/
^ 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.
^ 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.
^ 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.

[ibilabs-1] ttps://ibilabs.com/uranium-uranyl-thorium-compounds/uranyl-compounds/uranyl-fluoride/

[Ull-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.

[:0-4] 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.

[1]

[2]

[3]

[4]