Polyhalogen ions
![Structures of some isopolyhalogen cations](/Images/godic/202502/03/Structures_of_some_isopolyhalogen_cations4407.png")
![Solid state structures of the polyhalogen ions [BrF2]+, [ClF2]+, [ICl2]+ in their [SbF6]− salts.](/Images/godic/202502/03/Solid_state_structures_of_the_polyhalogen_ions_(BrF2)+._(ClF2)+,_(ICl2)+4407.png")
![Solid state structure of [I3Cl2]+ in [I3Cl2]+[AsCl6]−.](/Images/godic/202502/03/Solid_state_structure_of_the_(I3Cl2)+_ion4407.png")
![Structure of the [I2F12]− dimer present in [Me4N]+[IF6]−.](/Images/godic/202502/03/Structure_of_the_(I2F12)-_dimer4407.png")
Polyhalogen ions are a group of polyatomic cations and anions containing halogens only. The ions can be classified into two classes, isopolyhalogen ions which contain one type of halogen only, and heteropolyhalogen ions with more than one type of halogen.