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Properties of substance:

phosphonium iodide

Group of substances:

inorganic

Physical appearance:

colorless tetragonal crystals

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

H4IP

Structural formula as text:

PH4I

Molar/atomic mass: 161.91

Melting point (°C):

18.5

Boiling point (°C):

62.5

Decomposition temperature (°C):

30

Solubility (g/100 g of solvent):

water: reaction [Ref.]

Density:

2.86 (g/cm3)

Reactions of synthesis:

  1. The preparation of phosphonium iodide is usually effected by the hydrolysis of an intimate mixture of diphosphorus tetraiodide and white phosphorus. [Ref.1aster, Ref.2aster]
    10P2I4 + 13P4 + 128H2O → 40PH4I + 32H3PO4

Vapour pressure (Torr):

50 (20°C)

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

-69 (s)

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

123 (s)

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

109.6 (s)

References:

  1. The Merck Index 11th ed., Merck & Company, 1989. - pp. 1166
  2. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 208-209 [Russian]
  3. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 444 [Russian]
  4. Спицын В.И., Мартыненко Л.И. Неорганическая химия. - Ч.1. - М.: ИМУ, 1991. - pp. 137 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru