Bromine trifluoride

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Template:Chembox header |Bromine trifluoride
Bromine trifluoride
Template:Chembox header | General
Molecular formula BrF3
Molar mass 136.90 g/mol
Appearance straw-coloured liquid
CAS number [7787-71-5]
Template:Chembox header | Properties
Density and phase 2.8 g/ml, liquid
Solubility in water decomposes
Melting point 8.8 °C
Boiling point 125.8 °C
Viscosity ? cP at ? °C
Template:Chembox header | Structure
Molecular shape T-shaped
Dipole moment 1.19 D
Template:Chembox header | Hazards
MSDS External MSDS
EU classification not listed
NFPA 704
Template:NFPA 704
Template:Chembox header | Supplementary data page
Structure and
n, εr, etc.
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Template:Chembox header | Related compounds
Other anions Bromine monochloride
Other cations Chlorine trifluoride
Iodine trifluoride
Related compounds Bromine monofluoride
Bromine pentafluoride
Template:Chembox header | Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

Bromine trifluoride is a highly toxic and corrosive fluoride of bromine with chemical formula BrF3. It was discovered by Paul Lebeau in 1906.[1] It occurs as a colorless, yellow, or gray fuming liquid with an irritating odor. It is soluble in sulfuric acid but may explode on contact with water.


Bromine trifluoride can be obtained by the reaction of bromine with fluorine at 20 °C.

Br2 + 3F2 → 2BrF3

The disproportionation of bromine monofluoride is also a source for bromine trifluoride.

3BrF → BrF3 + Br2[2]



Like ClF3 and IF3 the BrF3 molecule is T-shaped. With the two electron pairs the coordination number is 5. The distance from the bromine each axial fluorine is 1.81 Å and to the equatorial fluorine is 1.72 Å. The angle between an axial fluorine and the equatorial fluorine is slightly smaller than 90° — the 86.2° angle observed is due to the replusion generated by the electron pairs being greater than that of the Br-F bonds.[3][4]


  1. Lebeau P. (1906). "The effect of fluorine on chloride and on bromine". Annales de Chimie et de Physique. 9: 241–263.
  2. Simons JH (1950). "Bromine (III) Fluoride - Bromine Trifluoride". Inorganic Synthesis. 3: 184–186.
  3. Gutmann V (1950). "Die Chemie in Bromtrifuoride". Angewante Chemie. 62: 312–315.
  4. Meinert H (1967). "Interhalogenverbindungen". Zeitschrift für Chemie. 7: 41.

External links