Polydentate

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Maeve Miller 1A
Posts: 51
Joined: Fri Aug 09, 2019 12:16 am

Polydentate

Postby Maeve Miller 1A » Wed Nov 20, 2019 5:07 pm

Can someone explain how to determine whether or not a ligand is polydentate? Does it always involve drawing out the full compound to see where lone pairs are present?

Brian_Ho_2B
Posts: 182
Joined: Fri Aug 09, 2019 12:16 am

Re: Polydentate

Postby Brian_Ho_2B » Wed Nov 20, 2019 5:10 pm

Maeve Miller 1A wrote:Can someone explain how to determine whether or not a ligand is polydentate? Does it always involve drawing out the full compound to see where lone pairs are present?

A ligand is considered polydentate if it has two or more lone pairs that it is able to donate to the lewis acid/TM cation. The easiest way to see if a ligand CAN be polydentate is to draw out its lewis structure. I say it CAN be a polydentate because even though water has two lone pairs, a lot of times it acts as a monodentate as only one lone pair is "donated" to the TM cation, or it only binds at one spot.

KnarGeghamyan1B
Posts: 85
Joined: Fri Aug 09, 2019 12:15 am

Re: Polydentate

Postby KnarGeghamyan1B » Wed Nov 20, 2019 5:38 pm

I'd say yes draw it out to be sure the formal charges are correct and the number of lone pairs on the central atom are correct. I doubt there will be a test question where part a doesn't involve drawing the shape anyway.


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