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Uranium pentafluoride

Uranium pentafluoride
Beta-UF5.png
β form
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.991
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.

It can be produced by reduction of the hexafluoride with carbon monoxide at elevated temperatures.

Other reducing agents have been examined.

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. The structure is reminiscent of that for vanadium pentafluoride.

In β form, the uranium centers adopt a square antiprismatic structure. The β polymorph gradually converts to α at 130 °C.

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.


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