Bromine trifluoride is a highly toxic and corrosive fluoride of bromine with chemical formula BrF3. It was discovered by Paul Lebeau in 1906. 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.
Like ClF3 and IF3 the BrF3molecule 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.
^ Lebeau P. (1906). "The effect of fluorine on chloride and on bromine". Annales de Chimie et de Physique9: 241-263.