## polydentate? 17.33

Hyein Cha 2I
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### polydentate? 17.33

Could someone please explain how to determine if a ligand is polydentate or not?

Also, how do you determine if a ligand, for example, CO3 2- (part b of 17.33) has atoms will lone pair of electrons which makes it polydentate? Is drawing the lewis structure the only way to determine it?

Esin Gumustekin 2J
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Joined: Thu Jul 27, 2017 3:01 am

### Re: polydentate? 17.33

I think we can determine if something is polydentate by looking at how many lone pairs the molecule has because the lone pairs may be used for bonding to a metal center.

However, I'm also confused on this problem because Table 17.4 doesn't state that CO3 2- is bidentate but the answer key for that problem states that it could be bidentate. How are we supposed to determine if something is bidentate if it's not on the table?

Nisarg Shah 1C
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### Re: polydentate? 17.33

When you draw the lewis structure for CO32-, there is one C-O double bond, and two single C-O bonds. The single bonds leave the oxygen atom with a -1 formal charge and these atoms have the potential to bind a metal atom in two different places, hence making CO32- a bidentate ligand.

Hyein Cha 2I
Posts: 103
Joined: Fri Sep 29, 2017 7:05 am
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### Re: polydentate? 17.33

Nisarg Shah 1C wrote:When you draw the lewis structure for CO32-, there is one C-O double bond, and two single C-O bonds. The single bonds leave the oxygen atom with a -1 formal charge and these atoms have the potential to bind a metal atom in two different places, hence making CO32- a bidentate ligand.

Ohhh so we use formal charge to determine whether a ligand is bidentate/polydentate?

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