Polydentate Ligand

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Helen Mejia 1I
Posts: 67
Joined: Fri Sep 28, 2018 12:24 am

Polydentate Ligand

Postby Helen Mejia 1I » Sat Dec 01, 2018 2:13 pm

How can we determine if a ligand is polydentate? Can we tell by drawing the Lewis structure?

305113590
Posts: 66
Joined: Fri Sep 28, 2018 12:28 am

Re: Polydentate Ligand

Postby 305113590 » Sat Dec 01, 2018 4:10 pm

We know when there are two or more places where a metal atom/ion can bind to the lone pairs of a ligand. You can definitely use Lewis Structures (3D dimensional analysis, too) to understand where the metal will bind.

Faith Fredlund 1H
Posts: 68
Joined: Fri Sep 28, 2018 12:18 am

Re: Polydentate Ligand

Postby Faith Fredlund 1H » Sat Dec 01, 2018 4:44 pm

The 7th edition of the textbook states on page 725 that "some ligands are polydentate ("many toothed") and can occupy more than one binding site simultaneously," This is because they have one or more extra lone pairs of electrons that can be used to bind to the central metal atom. An example of a polydentate ligand would be the bidentate ethylenediamine molecule NH2CH2CH2NH2 that has a Nitrogen with a lone pair of electrons that is bound to the central metal atom in another location.

Saman Andalib 1H
Posts: 73
Joined: Fri Sep 28, 2018 12:16 am

Re: Polydentate Ligand

Postby Saman Andalib 1H » Sat Dec 01, 2018 4:47 pm

A molecule is polydentate when it can bind at 2 or more different locations. These locations are determined if there are lone pair electrons available for coordinate bonding.


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