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Bromine pentafluoride

Bromine pentafluoride
IUPAC name Bromine pentafloride
CAS number 7789-30-2
Molecular formula BrF5
Molar mass 174.894 g.mol−1
Appearance Pale yellow solid
Melting point

−61.30 °C

Boiling point

40.25 °C

MSDS External MSDS
MSDS External MSDS
NFPA 704
R/S statement R2 R23 R24 R25
Flash point Non-flammable
Related Compounds
Other anions Bromine monochloride
Other cations Chlorine pentafluoride
Iodine pentafluoride
Related compounds Bromine monofluoride
Bromine trifluoride
Supplementary data page
Structure and
n, εr, etc.
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
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.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Bromine_pentafluoride". A list of authors is available in Wikipedia.
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