Bromine monofluoride

Bromine monofluoride
Names
IUPAC name
Bromine monofluoride
Identifiers
3D model (JSmol)
ChemSpider
UN number 1745
  • InChI=1S/BrF/c1-2
    Key: MZJUGRUTVANEDW-UHFFFAOYSA-N
  • FBr
Properties
BrF
Molar mass 98.903 g/mol
Density 4.403 g/L [1]
Melting point −33 °C (−27 °F; 240 K)[1]
Boiling point 20 °C (68 °F; 293 K) (decomposes)[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Bromine monofluoride is a quite unstable interhalogen compound with the chemical formula BrF. It can be produced through the reaction of bromine trifluoride (or bromine pentafluoride) and bromine. Due to its lability, the compound can be detected but not isolated:[2]

BrF3 + Br2 → 3 BrF
BrF5 + 2 Br2 → 5 BrF
Br2(l) + F2(g) → 2 BrF(g)

It is usually generated in the presence of caesium fluoride.[3]

Bromine monofluoride decomposes at normal temperature through dismutation to bromine trifluoride, bromine pentafluoride, and free bromine.

The molecular structure in the gas phase was determined by microwave spectroscopy; the bond length is re = 1.758981(50) Å.[4]

The bond length in a cocrystal with methylchloride is 1.822(2) Å; the lengthening relative to the free molecule is due to an interaction of the type F-Br···ClMe with a distance of 2.640(1) Å.[5]

See also

References

  1. ^ a b c David R. Lide: CRC Handbook of Chemistry and Physics. 89. Auflage, Taylor & Francis, 2008, ISBN 978-1-4200-6679-1, S. 4–53.
  2. ^ Macintyre, J. E.; Daniel, F. M.; Stirling, V. M. (1992). Dictionary of Inorganic Compounds. CRC Press. p. 285. ISBN 978-0-412-30120-9.
  3. ^ Winter, Rolf; Terjeson, Robin J.; Gard, Gary L. (1998). "An Improved and Facile Preparation of SF5Br". Journal of Fluorine Chemistry. 89: 105–106. doi:10.1016/S0022-1139(98)00094-3.
  4. ^ Nair, K. P. R. (1979). "Electric dipole moment of diatomic interhalogen molecules,". Kem. Kozl. 52: 431.
  5. ^ Drews, Thomas; Seppelt, Konrad (October 2012). "Bromine Monofluoride". Zeitschrift für anorganische und allgemeine Chemie. 638 (12–13): 2106–2110. doi:10.1002/zaac.201200293.


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