Ionization isomerism arises when the coordination compounds give different ions in solution.
[Co(NH3)4(NO2)2]Cl⇌[Co(NH3)4(NO2)2]++Cl−
Linkage isomerism occurs in complex compounds which contain ambidentate ligands like NO2−,SCN−,CN−,S2O32− and CO [Co(NH3)4(NO2)2]Cl and [Co(NH3)4(ONO)2]Cl are linkage isomers as NO2− is linked through N or through O Octahedral complexes of the type Ma4b2 exhibit geometrical isomerism