Difference between chelating ligand and polydentate ligand

[Hannah Lee 2F]

Are all complexes with a polydentate ligand examples of chelation?

Are all complexes that include a polydentate ligand considered chelating complexes? Is any ligand that is not monodentate an example of chelation, or is it restricted to complexes with a large coordination number, like EDTA?

Similarly, is a polydentate ligand essentially the same thing as chelating ligand, or are there differences?

[NRobbins_1K]

As far as I can tell from doing a bit of research, polydentate is always synonymous with chelating and monodentate with nonchelating. Reading through this page led me to that conclusion.

https://chem.libretexts.org/Bookshelves ... _Chemistry)/Coordination_Chemistry/Structure_and_Nomenclature_of_Coordination_Compounds/Ligands#Polydentate_Ligands

[Kristina Rizo 2K]

As far as I can tell from doing a bit of research, polydentate is always synonymous with chelating and monodentate with nonchelating. Reading through this page led me to that conclusion.

https://chem.libretexts.org/Bookshelves ... _Chemistry)/Coordination_Chemistry/Structure_and_Nomenclature_of_Coordination_Compounds/Ligands#Polydentate_Ligands

hey i was wondering if you could retype the link? I copy and pasted the whole URL but it said page was not found.

[Abigail Sanders 1E]

I believe that polydentate means that a ligand can bind to multiple molecules at different locations. Simply stated, polydentate describes the number of available bonding sites on a ligand. If a ligans is chelating, this means that it forms a type of ring structure than can bond to the same central atom more than once. This is portrayed in the Heme complex of Iron and the porphyrin ligand that Dr. Lavelle explained in class.

[NRobbins_1K]

sorry if its too late

https://chem.libretexts.org/Bookshelves ... _Chemistry)/
Coordination_Chemistry/Structure_and_Nomenclature_of_Coordination_Compounds/Ligands

hopefully that works