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{{chembox |
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| verifiedrevid = 274786439 |
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|verifiedrevid = 409424436 |
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| Name = Uranyl fluoride |
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| ImageFile = Uranyl-fluoride-3D-vdW.png |
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|Name = Uranyl fluoride |
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|ImageFile = UO2F2.PNG |
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<!-- | ImageSize = 200px --> |
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| ImageName = Uranyl fluoride |
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|ImageSize = 200px |
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|ImageName = Uranyl fluoride |
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| IUPACName = Uranium fluoride oxide |
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|IUPACName = Uranium fluoride oxide |
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| OtherNames = Uranium oxyfluoride |
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|OtherNames = Uranium oxyfluoride |
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| Section1 = {{Chembox Identifiers |
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|Section1 = {{Chembox Identifiers |
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| CASNo = 13536-84-0 |
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|CASNo = 13536-84-0 |
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|CASNo_Ref = {{Cascite|correct|CAS}} |
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}} |
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|ChemSpiderID = 4937337 |
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| Section2 = {{Chembox Properties |
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|EC_number = 236-898-8 |
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| Formula = UO<sub>2</sub>F<sub>2</sub> |
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|PubChem = 6432077 |
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| MolarMass = 308.02 g/mol |
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|StdInChI=1S/2FH.2O.U/h2*1H;;;/q;;;;+2/p-2 |
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| Solvent = other solvents |
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|StdInChIKey = KCKICANVXIVOLK-UHFFFAOYSA-L |
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| SolubleOther = VS |
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|SMILES = O==O.. |
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| MeltingPt = Decomposes @ 300°C |
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| BoilingPt = Sublimes}} |
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|Section2 = {{Chembox Properties |
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'''Uranyl fluoride''' (UO<sub>2</sub>F<sub>2</sub>), a compound of ], is an intermediate in the conversion of ] UF<sub>6</sub> to an ] or metal form and is a direct product of the reaction of UF<sub>6</sub> with moisture in the air. It is very soluble in water. Uranyl fluoride also is ] and changes in color from brilliant orange to yellow after reacting with water. Uranyl fluoride is reported to be stable in air to 300°C, above which slow decomposition to ] occurs. When heated to decomposition, UO<sub>2</sub>F<sub>2</sub> emits toxic fluoride fumes. |
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|Formula = UO<sub>2</sub>F<sub>2</sub> |
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|MolarMass = 308.02 g/mol |
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|Solvent = other solvents |
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|SolubleOther = VS |
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|MeltingPt = Decomposes @ 300 °C |
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|BoilingPt = Sublimes |
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|Section3 = {{Chembox Hazards |
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|GHSPictograms = {{GHS06}}{{GHS08}}{{GHS09}} |
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|GHSSignalWord = Danger |
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|HPhrases = {{H-phrases|300|330|373|411}} |
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|PPhrases = {{P-phrases|}} |
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'''Uranyl fluoride''' is the ] with the formula UO<sub>2</sub>F<sub>2</sub>. It is most notable as a contaminant in the production of ].<ref name=Ull>{{cite book |doi=10.1002/14356007.a27_281.pub2 |chapter=Uranium, Uranium Alloys, and Uranium Compounds |title=Ullmann's Encyclopedia of Industrial Chemistry |date=2007 |last1=Peehs |first1=Martin |last2=Walter |first2=Thomas |last3=Walter |first3=Sabine |last4=Zemek |first4=Martin |isbn=978-3-527-30385-4 }}</ref> |
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As shown by ], the uranyl (UO<sub>2</sub><sup>2+</sup>) centers are complemented by six fluoride ligands.<ref>{{cite journal |doi=10.1107/S0365110X48000764|title=Crystal chemical studies of the 5f-series of elements. III. A study of the disorder in the crystal structure of anhydrous uranyl fluoride|year=1948|last1=Zachariasen|first1=W. H.|journal=Acta Crystallographica|volume=1|issue=6|pages=277–281|doi-access=free|bibcode=1948AcCry...1..277Z }}</ref> |
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In accidental releases of UF<sub>6</sub>, UO<sub>2</sub>F<sub>2</sub>, as a solid particulate compound, may deposit on the ground. The overall chemical reaction of this event can be represented as: UF<sub>6</sub>+ 2H<sub>2</sub>O → UO<sub>2</sub>F<sub>2</sub>+ 4HF. These reactions can take place whether the uranium hexafluoride is a solid or a gas, but will take place almost instantaneously when the UF<sub>6</sub> is in a gaseous state. The resulting ] and the presence of additional water results in formation of solids (primarily Hydrofluoric ]s of hydrated uranyl fluoride (UO<sub>2</sub>F<sub>2</sub>-nH<sub>2</sub>O). |
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This salt is very soluble in water as well as ]. It is formed in the hydrolysis of ] (UF<sub>6</sub>): |
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==Toxicology== |
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: UF<sub>6</sub> + 2 H<sub>2</sub>O → UO<sub>2</sub>F<sub>2</sub> + 4 HF |
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Chemical hazards are far more significant than radioactive hazards, though there is a radioactivity concern if prepared with enriched uranium. Material is corrosive, and harmful by inhalation, ingestion or skin absorption. Ingestion or inhalation may be fatal. Effects of exposure may be delayed. |
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It can also be formed in the hydrofluorination of ] (UO<sub>3</sub>): |
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: UO<sub>3</sub> + 2 HF → UO<sub>2</sub>F<sub>2</sub> + H<sub>2</sub>O<ref name=":0">{{Cite journal |last1=Jang |first1=Harry |last2=Louis-Jean |first2=James |last3=Poineau |first3=Frederic |date=2023-06-20 |title=Synthesis and Morphological Control of UO<sub>2</sub>F<sub>2</sub> Particulates |journal=ACS Omega |language=en |volume=8 |issue=24 |pages=21996–22002 |doi=10.1021/acsomega.3c01999 |issn=2470-1343 |pmc=10286299 |pmid=37360455}}</ref> |
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==References== |
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== References == |
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Appendix A of the PEIS (DOE/EIS-0269) |
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<references />{{Uranium compounds}} |
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A literature review on the chemical and physical properties of uranyl fluoride, Myers, W.L. (Los Alamos National Lab., NM (USA) Illinois Univ. Urbana, IL (USA). |
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{{Uranium compounds}} |
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{{Inorganic-compound-stub}} |
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{{Inorganic-compound-stub}} |
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