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Properties of substance:

sulfur tetrafluoride

Group of substances:

inorganic

Physical appearance:

colorless gas

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

F4S

Structural formula as text:

SF4

Molar/atomic mass: 108.05

Melting point (°C):

-121

Boiling point (°C):

-38

Solubility (g/100 g of solvent):

benzene: soluble [Ref.]
water: reaction [Ref.]

Numerical data:

Year of discovery: 1929
LCt50 (mg·min/l): 20.155

Density:

1.919 (-73°C, g/cm3)

Reactions of synthesis:

  1. Yeild 90%. [Ref.1aster]
    3SCl2 + 4NaF → SF4 + S2Cl2 + 4NaCl
  2. [Ref.1]
    S + 4ClF → SF4 + 2Cl2

Reactions:

  1. Yeild 90%. [Ref.1]
    CF3OF + SF4 → CF3OSF5
  2. Yeild 65%. [Ref.1, Ref.2]
    H2NCN + SF4 → F2S=NCN + 2HF
  3. Yeild 70%. [Ref.1aster]
    12SF4 + 64NH3 → 3S4N4 + 48NH4F + 2N2
  4. Yeild 100%. [Ref.1]
    SF4 + F2 → SF6
  5. Yeild 100%. [Ref.1aster]
    C6H5IO2 + 2SF4 → C6H5IF4 + 2SOF2
  6. Yeild 35%. [Ref.1]
    CH3CHO + SF4 → CH3CHF2 + SOF2
  7. Yeild 24%. [Ref.1]
    H2NCH2COOH + 2SF4 → CF3CH2NH2 + 2SOF2 + HF
  8. Yeild 45%. [Ref.1]
    CH2=CHCOOH + 2SF4 → CF3CH=CH2 + 2SOF2 + HF
  9. Yeild 40%. [Ref.1]
    HO3SCH2COOH + 3SF4 → CF3CH2SO2F + 3SOF2 + 2HF
  10. [Ref.1]
    P4S10 + 5SF4 → 4PF5 + 15S
  11. [Ref.1]
    4CS2 + 3SF4 → CF3SSCF3 + CF3SSSCF3 + 6S

Vapour pressure (Torr):

80.8 (-73°C)

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

-770 (g)

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

-725.9 (g)

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

289.8 (g)

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

70.92 (g)

Enthalpy (heat) of vaporization ΔvapH (kJ/mol):

22

Critical temperature (°C):

91

References:

  1. Bell C.F. Syntheses and Physical Studies of Inorganic Compounds. - Pergamon Press, 1972. - pp. 92-101
  2. Dmowski W. Advances in fluorination of organic compounds with sulphur tetrafluoride / Journal of Fluorine Chemistry. - 1986. - Vol. 32, No. 3. - pp. 255-282 [DOI: 10.1016/S0022-1139(00)80512-6]
  3. Simons J.H. Fluorine Chemistry. - Vol. 5. - New York: Academic Press, 1964. - pp. 64-67
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 97 [Russian]
  5. Рысс И.Г. Химия фтора и его неорганических соединений. - М., 1956. - pp. 159 [Russian]
  6. Хардин А.П., Горбунов Б.Н., Протопопов П.А. Химия четырехфтористой серы. - Издательство Саратовского университета, 1973 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru