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Properties of substance:

dioxygen difluoride

Synonyms:

fluorine dioxide

Group of substances:

inorganic

Physical appearance:

gas

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

F2O2

Structural formula as text:

O2F2

Molar/atomic mass: 69.996

Melting point (°C):

-154

Boiling point (°C):

-57

Decomposition temperature (°C):

-60

Solubility (g/100 g of solvent):

fluorine liquid: insoluble [Ref.]
hydrogen fluoride : 6.2 (-97°C) [Ref.]
hydrogen fluoride : 13.1 (-87°C) [Ref.]
nitrogen liquid: insoluble [Ref.]
nitrogen trifluoride: very slightly soluble [Ref.]
octafluoropropane: very slightly soluble [Ref.]
oxygen liquid: insoluble [Ref.]
tetrafluorohydrazine: very slightly soluble [Ref.]
tetrafluoromethane: very slightly soluble [Ref.]

Interatomic distances and bond angles:

Interatomic distances (in pm): 157,5 (O-F)
Interatomic distances (in pm): 121,7 (O-O)
Bond angles (in degrees): 109,5 (O-O-F)

Numerical data:

Year of discovery: 1933

Reactions of synthesis:

  1. [Ref.1]
    O2 + F2 → O2F2

Reactions:

  1. [Ref.1]
    2O2F2 + 2SbF5 → 2O2SbF6 + F2

Half-life:

= 220 min (при -50 С)

Vapour pressure (Torr):

0.01 (-168°C)
0.05 (-163°C)
1 (-140.1°C)
3 (-132°C)
10 (-119.7°C)
257 (-79.5°C)

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

19.2 (g)

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

58.2 (g)

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

277.2 (g)

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

62.1 (g)

Enthalpy (heat) of vaporization at boiling point ΔvapH (kJ/mol)

19.1 (l) [Ref.]

References:

  1. Advances in Inorganic Chemistry and Radiochemistry. - 1963. - Vol. 5. - pp. 43-44
  2. Advances in Inorganic Chemistry and Radiochemistry. - 1974. - Vol. 16. - pp. 111-112
  3. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-11
  4. Гринвуд Н., Эрншо А. Химия элементов. - Т.1. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 594 [Russian]
  5. Никитин И.В. Химия кислородных соединений галогенов. - М.: Наука, 1986. - pp. 19-32 [Russian]
  6. Справочник химика. - 2 изд., Т.1. - Л.-М.: Химия, 1966. - pp. 607 [Russian]
  7. Успехи химии. - 1971. - Т.40, №11. - pp. 1921-1924 [Russian]
  8. Успехи химии. - 2002. - Т.71, №2. - pp. 99-100 [Russian]
  9. Фтор и его соединения. – Под ред. Саймонса Дж., Т. 1. - М.: ИИЛ, 1953. - pp. 75-76 [Russian]
  10. Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 389 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru