Krypton difluoride

Krypton difluoride, KrF2 is a chemical compound of krypton and fluorine. It was the first compound of krypton discovered. It is a volatile, colourless solid at room temperature. The structure of the KrF2 molecule is linear, with Kr−F distances of 188.9 pm. It reacts with strong Lewis acids to form salts of the KrF+ and Kr
2F+
3 cations.

Krypton difluoride
Names
IUPAC name
Krypton difluoride
Other names
Krypton fluoride
Krypton(II) fluoride
Identifiers
3D model (JSmol)
ChemSpider
UNII
  • InChI=1S/KrF2/c1-3-2 Y
    Key: QGOSZQZQVQAYFS-UHFFFAOYSA-N Y
  • InChI=1/F2Kr/c1-3-2
    Key: QGOSZQZQVQAYFS-UHFFFAOYAJ
  • F[Kr]F
Properties
F2Kr
Molar mass 121.795 g·mol−1
Appearance Colourless crystals (solid)
Density 3.24 g cm−3 (solid)
Reacts
Structure
Body-centered tetragonal
P42/mnm, No. 136
a = 0.4585 nm, c = 0.5827 nm
Linear
0 D
Related compounds
Related compounds
 Xenon difluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

The atomization energy of KrF2 (KrF2(g) → Kr(g) + F2(g)) is 21.9 kcal/mol, giving an average Kr–F bond energy of only 11 kcal/mol, the weakest of any isolable fluoride. In comparison, difluorine is held together by a bond of 36 kcal/mol. Consequently, KrF2 is a good source of the extremely reactive and oxidizing atomic fluorine. It is thermally unstable, with a decomposition rate of 10% per hour at room temperature. Krypton difluoride is endothermic, with a heat of formation of 14.4 ± 0.8 kcal/mol measured at 93 °C.

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