Unidentate: When the ligands can donate the pair of electrons from one atom, it is called unidentate ligands, e.g., NH3, H2O, CN– etc.

Didentate : When the ligand can donate the pair of electrons through two atoms of the ligand, it is called didentate ligand.





Ambidendate: It is that unidentate ligand which can ligate through two different atoms present in it to central atom/ion giving two different coordination entity. Examples are NO2– and SCN– ions. NO2– can ligate through either N or O atom and SCN can ligate through S or N atom to central atom/ion of coordination entity. This results into formation of linkage isomers.
For example : NO2– group can do coordination to metal ion through or atom forming nitro complex or through oxygen atom forming nitrito complex.
[Co(NH3)5(–NO2)]2+ and [Co(NH3)5(–ONO)]2+.

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