Question

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

Answer 1

A ligand may contain one or more unshared pairs of electrons which are called the donor sites of ligands. Now, depending on the number of these donor sites, ligands can be classified as follows:
(a)Unidentate ligands:Ligands with only one donor sites are called unidentate ligands. Fore.g Cl3-etc.

(b)Didentate ligands:Ligands that have two donor sites are called didentate ligands.
For e.g.,
(a) Ethane-1,2-diamine

c)Ambidentate ligands:
Ligands that can attach themselves to the central metal atom through two different atoms are called ambidentate ligands. For example:
(a)The donor atom is N
(b) The donor atom is oxygen
(c)The donor atom is S
(d)The donor atom is N
hope this will help u!!!

Answer 2

Answer:

( i ) Unidentate ligands : these are ligands with one donor site. Example Cl– , NH3

( ii )  Ambidentate ligands : these are ligands that fasten themselves to the central metal ion/ atom via two different atoms.

Example NO–2or ONO– , CN– or NC–

( iii ) Didentate – these are ligands with two donor sites.

Example – Ethane-1,2-diamine , Oxalate ion ( C2O42- )