(edta) Ligand's Binding Sites

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jgreynoso 2J
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Joined: Fri Sep 25, 2015 3:00 am

(edta) Ligand's Binding Sites

Postby jgreynoso 2J » Wed Nov 11, 2015 6:55 pm

I understand that the ligand can bind at 6 sites to a central ion because of the lone pairs of each oxygen with only one single bond, making it hexadentate. Why do the other oxygens which are double bonded not count as binding sites if they also contain lone pairs?

Thank you

Dahriel Aron 3A
Posts: 60
Joined: Fri Sep 25, 2015 3:00 am

Re: (edta) Ligand's Binding Sites

Postby Dahriel Aron 3A » Wed Nov 11, 2015 9:15 pm

oxygens want 2 lone pairs and 2 bonds, so when the oxygens with 3 lone pairs make a bond, it is the most favorable. This happens 4 times in edta. The two nitrogen are also left with one single lone pair which can become a bond as well. Altogether, this creates 6 sites for bonds making edta hexadentate.

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