What is ionization isomerism? Give example.
Compounds which gives different ions in solution although they have same composition are called ionisation isomerism.
This form of isomerism arises when the counter ion in a complex salt is itself a potential ligand and can displace a ligand which can then become the counter ion.
An example is provided by the ionisation isomers [Co(NH3)5SO4]Br and [Co(NH3)5Br]SO4.
Another example is, [Pt(NH3)4(OH)2]SO4 and Pt(NH3)4SO4](OH)2.