Write a note on ambidentate ligands.

(N/A) Ambidentate ligands are a type of monodentate ligand that has more than one potential donor atom and can coordinate to the metal ion through only one donor atom at a time.
Examples: $NO_{2}^{-}$,$SCN^{-}$,$CN^{-}$,$S_{2}O_{3}^{2-}$ etc.
$(i)$ $NO_{2}^{-}$ (nitrite ion):
- $M \leftarrow NO_{2}$ (nitrito-$N$,coordinating through nitrogen)
- $M \leftarrow ONO$ (nitrito-$O$,coordinating through oxygen)
$(ii)$ $SCN^{-}$ (thiocyanate ion):
- $M \leftarrow SCN$ (thiocyanato-$S$,coordinating through sulphur)
- $M \leftarrow NCS$ (isothiocyanato-$N$,coordinating through nitrogen)