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Uranium pentafluoride

Uranium pentafluoride

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: :2UF4 + F2 → 2UF5 :2UF5 + F2 → 2UF6

It can be produced by reduction of the hexafluoride with carbon monoxide at elevated temperatures. : 2UF6 + CO → 2UF5 + COF2 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 the β form, the uranium centers adopt a square antiprismatic structure. The β polymorph gradually converts to α at 130 °C.5/U2F9 mixture was prepared by heating a β-UF5 sample from a previous study (5) at 180°C until there was no further change (in 24 hr) in the diffraction pattern." --

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.

Structure of molecular UF<sub>5</sub>.

References

References

  1. Gordon W. Halstead, P. Gary Eller "Uranium(V) Fluorides and Alkoxides" Inorganic Syntheses 1982, volume 21, 162. {{doi. 10.1002/9780470132524.ch35
  2. Eller, P. G.. (1979). "Crystal Structures of α-UF5 and U2F9 and Spectral Characterization of U2F9". Inorganica Chimica Acta.
  3. Howard, C. J.. (1982). "Crystallographic Parameters in α-UF5 and U2F9 by Multiphase Refinement of High-Resolution Neutron Powder Data". [[Journal of Solid State Chemistry]].
  4. Taylor, J. C.. (1980). "Neutron Diffraction Study of β-Uranium Pentafluoride Between 77 and 403 K". [[Journal of Solid State Chemistry]].
  5. Onoe, J.. (1997). "Structure and Bond Nature of the UF5 Monomer". Inorg. Chem..
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uranium(v)-compounds nuclear-materials fluorides actinide-halides inorganic-polymers coordination-polymers
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