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Properties of substance:

krypton difluoride

Group of substances:

inorganic

Physical appearance:

colorless tetragonal crystals

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

F2Kr

Structural formula as text:

KrF2

Molar/atomic mass: 121.8

Decomposition temperature (°C):

20

CAS №: 13773-81-4

Solubility (g/100 g of solvent):

bromine pentafluoride: 81 (20°C) [Ref.]
hydrogen fluoride : 195 (20°C) [Ref.]

Interatomic distances and bond angles:

Interatomic distances (in pm): 188,9 (Kr-F (233 K)) [gas]
Interatomic distances (in pm): 189,4 (Kr-F (148 K)) [α-form]
Interatomic distances (in pm): 189,2 (Kr-F (193 K)) [β-form]

Density:

3.3 (-73°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1]
    Kr + F2 → KrF2
  2. [Ref.1]
    Kr + F2 → KrF2

Reactions:

  1. [Ref.1]
    7KrF2 + 2Au → 2KrF[AuF6] + 5Kr
  2. Yeild 11,15%. [Ref.1aster]
    KrF2 + ClF5 + AsF5 → (ClF6)[AsF6] + Kr

Half-life:

= 30 sек (при 110 С)
= 120 sек (при 80 С)

Vapour pressure (Torr):

10 (-15.5°C)
30 (0°C)
73 (15°C)

ΔHsublimation (kJ/mol):

37

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

15.5 (s)

Standard molar enthalpy (heat) of formation ΔfH (298 K, kJ/mol)

60.2 (g) [Ref.]

Standard molar entropy S (298 K, J/(mol·K))

253.6 (g) [Ref.]

Molar heat capacity at constant pressure Cp (298 K, J/(mol·K))

54.2 (g) [Ref.]

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-69
  2. Lehmann J.F., Mercier H.P.A., Schrobilgen G.J. The chemistry of krypton / Coordination Chemistry Reviews. - 2002. - Vol. 233-234. - pp. 3-12, 29-35 [DOI: 10.1016/S0010-8545(02)00202-3]
  3. Holleman A.F., Wiberg E., Wiberg N. Lehrbuch der Anorganischen Chemie. - Berlin: Walter de Gruyter, 1995. - pp. 428
  4. Housecroft C.E., Sharpe A.G. Inorganic Chemistry. - 2ed. - 2005. - pp. 501
  5. Janiak C., Klapotke T.M., Meyer H.-J. Moderne Anorganische Chemie. - Berlin: Walter de Gruyter, 2003. - pp. 59-60
  6. Journal of Fluorine Chemistry. - 1975. - Vol. 5, №3. - pp. 273-274
  7. Journal of the American Chemical Society. - 1966. - Vol. 88, No. 24. - pp. 5924
  8. Nakajima T., Zemva B., Tressaud A. Advanced inorganic fluorides: Syntesis, Characterization and Applications. - Elsevier, 2000. - pp. 22
  9. Progress in inorganic chemistry. - Vol. 29. - John Wiley & Sons, 1982. - pp. 188, 190-191
  10. Soviet Atomic Energy. - 1971. - Vol. 31, No. 3. - pp. 990-999 [DOI: 10.1007/BF01375764]
  11. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 75 [Russian]
  12. Спицын В.И., Мартыненко Л.И. Неорганическая химия. - Ч.1. - М.: ИМУ, 1991. - pp. 233 [Russian]
  13. Термодинамические свойства индивидуальных веществ. - Т.1, Кн.2. - М.: Наука, 1978. - pp. 152 [Russian]
  14. Успехи химии. - 1974. - Т.43, №12. - pp. 2167, 2176-2179 [Russian]
  15. Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 523-524 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru