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Bromine pentafluoride

| NFPA-H = 4 | NFPA-F = 0 | NFPA-R = 3 | NFPA-S = W+OX Iodine pentafluoride Bromine trifluoride

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

BrF5 finds use in oxygen isotope analysis. Laser ablation of solid silicates in the presence of BrF5 releases O2 for subsequent analysis. It has also been tested as an oxidizer in liquid rocket propellants and is used as a fluorinating agent in the processing of uranium.

Preparation

BrF5 was first prepared in 1931 by the direct reaction of bromine and fluorine. This reaction is suitable for the preparation of large quantities, and is carried out at temperatures over 150 °C with an excess of fluorine:

:Br2 + 5 F2 → 2 BrF5

For the preparation of smaller amounts, potassium bromide is used:

:KBr + 3 F2 → KF + BrF5

This route yields BrF5 almost completely free of trifluorides and other impurities.

Reactions

BrF5 reacts with water to form bromic acid and hydrofluoric acid:

:BrF5 + 3 H2O → HBrO3 + 5 HF

It is an extremely effective fluorinating agent, being able to convert most metals to their highest fluorides even at room temperature. With uranium and uranium compounds, it can be used to produce uranium hexafluoride:

:5 U + 6 BrF5 → 5 UF6 + 3 Br2

Hazards

BrF5 reacts violently with water, and is severely corrosive and toxic. Its vapors are also extremely irritating to all parts of the human body, especially the skin, eyes and other mucous membranes. Like many other interhalogen compounds, it will release "smoke" containing acidic vapors if exposed to moist air, which comes from its reaction with the water in the air. Exposure to 100 ppm or more for more than one minute is lethal to most experimental animals. Chronic exposure may cause kidney damage and liver failure.{{cite book

Additionally, BrF5 is a strong oxidizing agent and may spontaneously ignite or explode upon contact with flammable substances such as organic materials and metal dust.

References

{{PGCH. 0065
(1963). "The use of bromine pentafluoride in the extraction of oxygen from oxides and silicates for isotopic analysis". Geochimica et Cosmochimica Acta.
(1968). "Synthesis routes to chlorine and bromine pentafluorides". Inorganic Chemistry.
{{Greenwood&Earnshaw2nd

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fluorides bromine(v)-compounds interhalogen-compounds fluorinating-agents oxidizing-agents substances-discovered-in-the-1930s

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