17.33 - Polydentate ligands

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kendallbottrell
Posts: 31
Joined: Fri Apr 06, 2018 11:02 am

17.33 - Polydentate ligands

Postby kendallbottrell » Mon Jun 04, 2018 10:09 pm

I have noticed that when determining if a molecule is polydentate or not, atoms that are attached to the central atom by double bonds do not "count" as ligands. For example, C204 2-, is bidentate even though it has four attached oxygen atoms because two of them are bonded by double bonds.

Is what I noticed always true? That atoms bound by double bonds do not count as ligands towards polydentate structure? If so, why?

Anna De Schutter - 1A
Posts: 66
Joined: Wed Feb 21, 2018 3:01 am

Re: 17.33 - Polydentate ligands

Postby Anna De Schutter - 1A » Mon Jun 04, 2018 11:28 pm

Also, if it is true that double bonds don't count as ligands, why can (CO3)2- be a monodentate or a bidentate (it has one double bonded O and two single bonded O), but oxalate (C2O4)2- can only be a bidentate (it has two double bonded O's and two single bonded O's)? Can't (C2O4)2- also be a monodentate or a bidentate like (CO3)2-?

Thank you :)
Anna De Schutter - section 1A


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