Uranium pentafluoride
β form | |
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3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.033.991 |
EC Number |
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PubChem CID |
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UNII |
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CompTox Dashboard (EPA) |
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InChI
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Properties | |
Chemical formula | UF5 |
Molar mass | 333.02 g/mol |
Appearance | Pale yellow crystalline solid |
Density | 5.823 g/cm3 (alpha polymorph) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references |
Uranium pentafluoride is the inorganic compound with the chemical formula UF5. It is a pale yellow paramagnetic solid. The compound has attracted interest because it is related to uranium hexafluoride, which is widely used to produce uranium fuel. It crystallizes in two polymorphs, called α- and β-UF5.
Synthesis and structure
Uranium pentafluoride is an intermediate in the conversion of uranium tetrafluoride to volatile UF6:
- 2 UF4 + F2 → 2 UF5
- 2 UF5 + F2 → 2 UF6
It can be produced by reduction of the hexafluoride with carbon monoxide at elevated temperatures.[1]
- 2 UF6 + CO → 2 UF5 + COF2
Other reducing agents have been examined.[2]
The α form is a linear coordination polymer consisting of chains of octahedral uranium centers in which one of the five fluoride anion forms a bridge to the next uranium atom.[3] The structure is reminiscent of that for vanadium pentafluoride.
In the β form, the uranium centers adopt a square antiprismatic structure.[4] The β polymorph gradually converts to α at 130 °C.[3]
Monomeric UF5
Of theoretical interest, molecular UF5 can be generated as a transient monomer by UV-photolysis of uranium hexafluoride. It is thought to adopt a square pyramidal geometry.[5]
References
- ^ Gordon W. Halstead, P. Gary Eller "Uranium(V) Fluorides and Alkoxides" Inorganic Syntheses 1982, volume 21, 162. doi:10.1002/9780470132524.ch35
- ^ Eller, P. G.; Larson, A. C.; Peterson, J. R.; Ensor, D. D.; Young, J. P. (1979). "Crystal Structures of α-UF5 and U2F9 and Spectral Characterization of U2F9". Inorganica Chimica Acta. 37 (2): 129–133. doi:10.1016/S0020-1693(00)95530-0.
- ^ a b Howard, C. J.; Taylor, J. C.; Waugh, A. B. (1982). "Crystallographic Parameters in α-UF5 and U2F9 by Multiphase Refinement of High-Resolution Neutron Powder Data". Journal of Solid State Chemistry. 45 (3): 396–398. Bibcode:1982JSSCh..45..396H. doi:10.1016/0022-4596(82)90185-2.
- ^ Taylor, J. C.; Waugh, A. B. (1980). "Neutron Diffraction Study of β-Uranium Pentafluoride Between 77 and 403 K". Journal of Solid State Chemistry. 35 (2): 137–147. Bibcode:1980JSSCh..35..137T. doi:10.1016/0022-4596(80)90485-5.
- ^ Onoe, J.; Nakamatsu, H.; Mukoyama, T.; Sekine, R.; Adachi, H.; Takeuchi, K. (1997). "Structure and Bond Nature of the UF5 Monomer". Inorg. Chem. 36 (9): 1934–1938. doi:10.1021/ic961237s. PMID 11669800.
- v
- t
- e
- UB2
- US
Organouranium(III) compounds |
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- U(BH4)4
- UC
- UCl4
- UF4
- UBr4
- UI4
- UO2
- UH4
- USi2
- US2
- USe2
- UTe2
- U(SO4)2
Organouranium(IV) compounds |
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- U2N3
- U3O8
- UCl5
- UF5
- UBr5
- UI5
- U2O5
- (NH4)2U2O7
- Na2U2O7
- UCl6
- UF6
- U(PO4)2
- UO3
- UO4
- UO2(CH3COO)2
- UO2(CHO2)2
- UO2CO3
- UO2CO3·2(NH4)2CO3
- UO2Cl2
- UO2F2
- UO2(NO3)2
- UO2(OH)2
- (UO2)2(OH)4
- UO2(SO4)2
- ZnUO2(CH3COO)4
- UN2
- H2UO4
- Na4UO2(CO3)3
- UO6 (hypothetical)