Bromine monofluoride

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| ImageFile1 = Bromine-monofluoride-2D.png

| ImageSize1 =

| ImageFile2 = Bromine-monofluoride-3D-vdW.png

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| IUPACName = Bromine monofluoride

| OtherNames =

|Section1={{Chembox Identifiers

| CASNo = 13863-59-7

| PubChem = 139632

| ChemSpiderID = 20474212

| UNNumber = 1745

| SMILES = FBr

| StdInChI = 1S/BrF/c1-2

| StdInChIKey = MZJUGRUTVANEDW-UHFFFAOYSA-N

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|Section2={{Chembox Properties

| Formula = BrF

| MolarMass = 98.903 g/mol

| Appearance =

| Density = 4.403 g/L David R. Lide: CRC Handbook of Chemistry and Physics. 89. Auflage, Taylor & Francis, 2008, {{ISBN|978-1-4200-6679-1}}, S. 4–53.

| MeltingPtC = −33

| MeltingPt_ref =

| BoilingPtC = 20

| BoilingPt_notes = (decomposes)

| Solubility =

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|Section3={{Chembox Hazards

| MainHazards =

| FlashPt =

| AutoignitionPt =

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Bromine monofluoride is a quite unstable interhalogen compound with the chemical formula BrF. It can be produced through the reaction of bromine trifluoride (or bromine pentafluoride) and bromine. Due to its lability, the compound can be detected but not isolated:{{cite book|first1=J. E. |last1=Macintyre |first2=F. M. |last2=Daniel |first3=V. M. |last3=Stirling |title=Dictionary of Inorganic Compounds |publisher=CRC Press |date=1992 |isbn=978-0-412-30120-9 |page=285}}

:BrF₃ + Br₂ → 3 BrF

:BrF₅ + 2 Br₂ → 5 BrF

:Br_2(l) + F_2(g) → 2 BrF_(g)

It is usually generated in the presence of caesium fluoride.{{cite journal |doi=10.1016/S0022-1139(98)00094-3|title=An Improved and Facile Preparation of SF₅Br|year=1998|last1=Winter|first1=Rolf|last2=Terjeson|first2=Robin J.|last3=Gard|first3=Gary L.|journal=Journal of Fluorine Chemistry|volume=89|pages=105–106}}

Bromine monofluoride decomposes at normal temperature through dismutation to bromine trifluoride, bromine pentafluoride, and free bromine.

The molecular structure in the gas phase was determined by microwave spectroscopy; the bond length is r_e = 1.758981(50) Å.{{Cite journal |last=Nair |first=K. P. R. |date=1979 |title=Electric dipole moment of diatomic interhalogen molecules, |journal=Kem. Kozl. |volume=52 |pages=431}}

The bond length in a cocrystal with methylchloride is 1.822(2) Å; the lengthening relative to the free molecule is due to an interaction of the type F-Br···ClMe with a distance of 2.640(1) Å.{{Cite journal |last=Drews |first=Thomas |last2=Seppelt |first2=Konrad |date=October 2012 |title=Bromine Monofluoride |url=https://onlinelibrary.wiley.com/doi/10.1002/zaac.201200293 |journal=Zeitschrift für anorganische und allgemeine Chemie |language=en |volume=638 |issue=12-13 |pages=2106–2110 |doi=10.1002/zaac.201200293|url-access=subscription }}