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An interhalogen compound is a molecule which contains two or more different halogen atoms (fluorine, chlorine, bromine, iodine, or sometimes even astatine) and no atoms of elements from any other group. Interhalogens are very reactive.

Interhalogen compounds

Interhalogens are generally compound from two different halogen species. The following table displays all confirmed combinations:

Halogen F Cl Br I At
F F2
Cl ClF, ClF3, ClF5 Cl2
Br BrF, BrF3, BrF5 BrCl Br2
I IF, IF3, IF5, IF7 ICl, (ICl3)2 IBr I2
At AtF (?) AtCl AtBr AtI At2 (?)


Interhalogens are extremely reactive chemical species. All react violently with water and may even explode.

Interhalogen compounds have different states of matter, depending on their formula:

  • Gaseous: ClF, BrF (b.p. 20 °C), BrCl, ClF3 (b.p. 11.75 °C), ClF5, IF7
  • Liquid: BrF3, BrF5, IF5
  • Solid: IF, ICl, IBr, IF3, ICl3

So far, there is no data on the states of astatine compounds.


Interhalogens are extremely corrosive and fluorine interhalogens can also react with glass.


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