Bromine pentafluoride

Jump to: navigation, search
Bromine pentafluoride
Structure and dimensions of the bromine pentafluoride molecule in the gas phase
Ball-and-stick model of bromine pentafluorideSpace-filling model of bromine pentafluoride
Systematic name Bromine pentafloride
Molecular formula BrF5
Molar mass 174.894 g.mol−1
Appearance Pale yellow solid
CAS number [7789-30-2]
Melting point −61.30 °C
Boiling point 40.25 °C
MSDS External MSDS
NFPA 704
NFPA 704.svg
Main Hazards Suspected:
gastrointestinal toxin
respiratory toxin
skin or sense organ toxin
explosion with water
very reactive like ClF3
very corrosive to skin
Flash point Non-flammable
R/S statement R2 R23 R24 R25
Supplementary data page
Related compounds
Other anions Bromine monochloride
Other cations Chlorine pentafluoride
Iodine pentafluoride
Related compounds Bromine monofluoride
Bromine trifluoride
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

Bromine pentafluoride, BrF5, is an interhalogen compound and a fluoride of bromine. It is a strong fluorination reagent.

It melts at −61.30 °C and boils at 40.25 °C. BrF5 finds use in oxygen isotope analysis. Laser ablation of solid silicates in the presence of bromine pentafluoride releases O2 for subsequent analysis.


It was the first time prepared in 1930.

It can be prepared by disproportiation of BrF:

3 BrF → BrF3 + Br2

Preparation of larger quantities can be accomplished by reaction with temperature over 150 °C and an excess of fluorine:

Br2 + 5 F2 → 2 BrF5

For preparation of smaller amounts can be used reaction:

KBr + 3 F2 → KF + BrF5


Bromine pentafluoride reacts explosively with water by reaction:

BrF5 + 3 H2O → HBrO3 + 5 HF


  1. N. N. Greenwood, A. Earnshaw. Chemie prvku (Chemistry of the Elements). Informatorium, Prague, 1993.

External links