Nomenclature
CAS number: 7783-81-5
F
6U; mol wt 352.02.
F 32.38%, U 67.62%.
UF
6.
Description and references
Prepd by the action of fluorine on uranium
metal or carbide; on uranium pentachloride; on uranium tetrafluoride;
on triuranium octaoxide in the presence of carbon. It appears that
all uranium compds when heated with fluorine to a sufficiently high
temp give UF6: National Nuclear Energy Series VIII-5, J. J. Katz, E. Rabinowitch, The Chemistry
of Uranium, part I (New York, 1951) pp 396-449.
Properties
Volatile, white monoclinic cryst solid. d420.7 5.09. d70 (liq) 3.595. mp 64.8°.
Sublimes at 56.5°. Critical temp 230.2°, crit pressure 45.5 atm:
Oliver et al., J. Am. Chem. Soc. 75, 2827 (1953). Reacts vigorously with water, forming
mainly UO2F2 and HF. Sol in liquid chlorine
and bromine. Dissolves in nitrobenzene to give a dark red soln fuming
in air. Sol in carbon tetrachloride, chloroform, and sym-tetrachloroethane, Cl2CHCHCl2, which forms
the most stable soln, extensive reaction occurring only after several
days at room temp. Sol in fluorocarbons (C6F12 or C7F16) without reaction. Best handled
in copper apparatus.