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Properties of substance:

phosphorus(III) fluoride

Synonyms:

trifluorophosphine

Group of substances:

inorganic

Physical appearance:

colorless gas

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

F3P

Structural formula as text:

PF3

Molar/atomic mass: 87.97

Melting point (°C):

-151.5

Boiling point (°C):

-101.4

Solubility (g/100 g of solvent):

ethanol: soluble [Ref.]
hydrogen chloride liquid anhydrous: soluble [Ref.]
sulfuric acid: soluble [Ref.]
water: reaction [Ref.]

Numerical data:

Year of discovery: 1884

Density:

0.003907 (20°C, g/cm3)

Reactions:

  1. [Ref.1]
    (CH3)4NF + PF3 → (CH3)4NPF4

Vapour pressure (Torr):

10 (-150°C)
100 (-128°C)

Dipole moment (D):

1.03 (20°C)

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

-956.5 (g)

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

-935.66 (g)

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

272.6 (g)

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

58.7 (g)

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

0.937

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

14.58

Critical temperature (°C):

-2.05

Critical pressure (MPa):

4.326

References:

  1. Advances in Inorganic Chemistry and Radiochemistry. - 1970. - Vol. 13. - pp. 364-367
  2. Гринвуд Н., Эрншо А. Химия элементов. - Т.1. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 463 [Russian]
  3. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 454 [Russian]
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 108 [Russian]
  5. Рысс И.Г. Химия фтора и его неорганических соединений. - М., 1956. - pp. 235-240 [Russian]
  6. Фтор и его соединения. – Под ред. Саймонса Дж., Т. 1. - М.: ИИЛ, 1953. - pp. 88-89 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru