What is meant by unidentate, didentate and ambidentate ligands ? Give two examples for each.

Explanation

A molecule or an ion having only one donor atom and forming one coordinate bond with the central metal atom is called unidentate ligand. For example, `Cl^(-)` and `NH_(3)`.
A molecule or an ion having two donor atoms and hence forming two coordinate bonds with the central metal atom is called a didentate ligand. For example,
A molecule or an ion which contains two donor atoms but only one of them forms a coordinate bond at a time with the central metal atom is called ambidentate ligand. For example, `CN^(-)` : or : `NC^(-)`: