Ionisation Isomers-:
[Co (NH3)5 (NO2) ]NO3 and
[Co (NH3)5 (NO3) ]NO2
Linkage Isomers-:
[Co (NH3)5 (NO2) ]NO3 and
[Co (NH3)5 (ONO) ]NO3
due to ambidentate ligand nitro/nitrito.
Complexes of this type [MA5B] do not show geometrical isomerism or cis-trans isomerism because positions of ligands wrt metal atom are equivalent..