Uranyl fluoride

Uranyl fluoride is the inorganic compound with the formula UO₂F₂. It is most notable as a contaminant in the production of uranium tetrafluoride.^[2]

Uranyl fluoride

Uranyl fluoride
Names
IUPAC name Uranium(VI) difluoride dioxide
Other names 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	brilliant orange solid[citation needed]
Density	6.37 g/cm3[1]
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). Y verify (what is YN ?) Infobox references

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.^{[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]