Uranium pentafluoride
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13775-07-0 | |
ChemSpider | 75545 |
Jmol 3D model | Interactive image |
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Properties | |
UF5 | |
Molar mass | 333.02 g/mol |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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
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 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
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