(CO3)2- polydentate ligand

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Tylor McGrew 1J
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Joined: Fri Sep 29, 2017 7:03 am

(CO3)2- polydentate ligand

Postby Tylor McGrew 1J » Sun Nov 26, 2017 3:52 pm

How come for (CO3)2-, this is either monodentate or bidentate? When do we know, which type of polydentate it is going to be?

Nishma Chakraborty 1J
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

Re: (CO3)2- polydentate ligand

Postby Nishma Chakraborty 1J » Sun Nov 26, 2017 5:57 pm


(CO3)-2 can either be a bidentate or monodentate due to its Lewis structure and resonance. When we draw the lewis structures for (CO3)2-, there are two possibilities, with one structure having a C=O bond and two C-O^-1 bonds. With this structure, the two O^-1's can bond to a metal at two different places, making it a bidentate. In another structure, there is a double bond between two Carbon and Oxygen bonds. Consequentially, only one Oxygen can bind to a metal, making this form of (CO3)2- a monodentate.

Because (CO3)-2 is a small molecule, I think most of the time it acts as a monodentate.

Hope this helps! :)

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