The compound of on halogen with the other halogen is called inter halogen compounds.
They are formed due to large electro negativity and size difference between halogens.
Let’s take an example: Let’s assume two halogens A and B.
B is more electronegative than A then they will form four types of compounds:
- AB example: ClF (Chlorine monofluoride),BrF(Bromine monofluoride).
- AB3 example: ClF3 (Chlorine trifluoride), BrF3 (Bromine trifluoride).
- AB5 example: BrF5 (Bromine pentafluoride).
- AB7 example: IF7 (iodine heptafluoride).
The inter-halogen compounds are unstable and very reactive.
- The larger halogen always serves as a central atom.
- The bonds formed are covalent.
- As the size difference decreases stability decreases and the polarity increases.
- Hydrolysis of these compounds always produces halide ion from smaller halogen and oxy halide from bigger halogen.
- They are strong oxidizing agents.
Structure of inter-halogen compounds:
- AB type – linear
- AB3 type - trigonal bi pyramidal
- AB5 type - square pyramidal
- AB7 type - pentagonal bipyramidal