Uranium pentafluoride

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Uranium pentafluoride
α form
UF5 monomer.png
CAS number 13775-07-0 N
ChemSpider 75545 N
Jmol-3D images Image 1
Molecular formula UF5
Molar mass 333.02 g/mol
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Uranium pentafluoride an inorganic chemical consisting of uranium and fluorine. The compound exists both as individual UF5 molecular entities and with extended order in several crystal-lattice forms. The monomer, formed by photolysis of uranium hexafluoride, has a square pyramidal geometry.[1] The α form is a linear coordination polymer consisting of chains in which one of the five fluoride atoms forms a bridge to the next uranium atom.[2] Uranium pentafluoride can be synthesized in the α form by reducing uranium hexafluoride with sulfur dioxide at 160 °C.[3] The β form, which gradually converts to the α form at 180 °C,[2] has a square antiprismatic lattice structure.[4]


  1. ^ 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. 
  2. ^ 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. 
  3. ^ 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. 
  4. ^ 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.