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What are polydentate ligands ?

Posted: Sun Jul 28, 2019 11:15 pm
by Radha Patel 1A
Can someone explain how you can tell if a ligand is a monodentate , bidentate, triedentate ligand etc... ?

Re: What are polydentate ligands ?

Posted: Sun Jul 28, 2019 11:18 pm
by Chem_Mod
Polydentate means that a ligand binds with a metal from multiple places. It "bites" from multiple locations. See below which I copy and pasted from my earlier post on chelating and polydentate.

Structure is very important when it comes to chelating and polydentate material. For example, because of the structure, a bidentate ligand can have 2 interactions per molecule. Look at these two links, both of oxalate with iron, and see how because of the structure of oxalate, it is binding to the iron from two different location. It is "biting" the iron with two different "teeth."

https://www.bing.com/images/search?view ... &eim=1,2,6

https://www.bing.com/images/search?view ... &eim=1,2,6

Re: What are polydentate ligands ?

Posted: Mon Jul 29, 2019 1:03 pm
by Gwynneth Orlino 1B
Polydentate ligands can attach to the central metal atom at more than 1 binding site. If it binds at one site/donates 1 e- pair, it's monodentate. 2 sites=bidentate, 3 sites=tridentate, and 4 sites=hexadentate.

Re: What are polydentate ligands ?

Posted: Mon Jul 29, 2019 11:31 pm
by Chris Charton 1F
Hexadentate is 6 binding sites.

Re: What are polydentate ligands ?

Posted: Tue Jul 30, 2019 1:07 pm
by Gwynneth Orlino 1B
Chris Charton 1F wrote:Hexadentate is 6 binding sites.


Oops, thanks for pointing out my mistake.