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Properties of substance:

uranium(VI) fluoride

Group of substances:

inorganic

Physical appearance:

colorless rhombic crystals

Empirical formula (Hill's system for organic substances):

F6U

Structural formula as text:

UF6

Molar/atomic mass: 352.02

Sublimation point (°C):

56.6

Solubility (g/100 g of solvent):

1,1,2,2-tetrachloro-1,2-difluoroethane: reaction [Ref.]
1,1,2,2-tetrachloroethane: soluble [Ref.]
benzene: reaction [Ref.]
bromine liquid: soluble [Ref.]
carbon disulphide: insoluble [Ref.]
carbon tetrachloride: soluble [Ref.]
chlorine liquid: soluble [Ref.]
chloroform: sparingly soluble [Ref.]
diethyl ether: reaction [Ref.]
ethanol: reaction [Ref.]
hydrogen fluoride : 17.25 (room temperature) [Ref.]
nitrobenzene: soluble [Ref.]
pentachloroethane: soluble [Ref.]
toluene: reaction [Ref.]
water: reaction [Ref.]
xylene: reaction [Ref.]

Interatomic distances and bond angles:

Interatomic distances (in pm): 199,4 (U-F) [gas]

Numerical data:

Year of discovery: 1880

Density:

5.06 (25°C, g/cm3)
3.595 (70°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1]
    U + 3F2 → UF6

Vapour pressure (Torr):

1 (-30.2°C)
10 (-6.2°C)
17.8 (0°C)
56.2 (15°C)
100 (23.6°C)
112.7 (25°C)
1129.5 (63.9°C)
1169 (65°C)
1360 (70.1°C)
1582 (75.2°C)
1830 (80°C)
1838 (80.3°C)
2087 (85.4°C)
2455 (90°C)
2765 (95°C)

Permittivity (dielectric constant):

2.18 (65°C)

Dipole moment (D):

0 (20°C)

Viscosity (mPa·s):

0.91 (70°C)

Surface tension (mN/m):

17.7 (65°C)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-2188 (s)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

-2053.5 (s)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

227.6 (s)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

166.7 (s)

ΔHsublimation (kJ/mol):

49.4

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-2148 (g)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

377 (g)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

130 (g)

Molar enthalpy (heat) of fusion ΔfusH (kJ/mol):

19.2

Critical temperature (°C):

230.2

Critical pressure (MPa):

4.61

References:

  1. Вдовенко В.М. Химия урана и трансурановых элементов. - М.-Л.: ИАН СССР, 1960. - pp. 105-111 [Russian]
  2. Галкин Н.П., Майоров А.А., Верятин У.Д., Судариков Б.Н., Николаев Н.С., Шишков Ю.Д., Крутиков А.Б. Химия и технология фтористых соединений урана. - М.: ГИЛОАНТ, 1961. - pp. 38-47 [Russian]
  3. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 576-577, 587-588 [Russian]
  4. Кац Дж., Рабинович Е. Химия урана. - М.: ИИЛ, 1954. - pp. 322-358 [Russian]
  5. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 102 [Russian]
  6. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 107 [Russian]
  7. Справочник по растворимости. - Т.1, Кн.2. - М.-Л.: ИАН СССР, 1962. - pp. 1015-1016 [Russian]
  8. Успехи химии. - 1961. - Т.30, №12. - pp. 1505-1515 [Russian]
  9. Фтор и его соединения. – Под ред. Саймонса Дж., Т. 1. - М.: ИИЛ, 1953. - pp. 102-103 [Russian]
  10. Химическая энциклопедия. - Т. 5. - М.: Советская энциклопедия, 1999. - pp. 45 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru