Polydentates

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Doreen Liu 4D
Posts: 54
Joined: Wed Sep 11, 2019 12:17 am

Polydentates

Postby Doreen Liu 4D » Mon Dec 02, 2019 7:29 pm

Why is CO3^2- a tridentate ligand while Oxalate (C2O4^2-) is a bidentate not a tetradentate ligand?

205296774
Posts: 66
Joined: Thu Jul 25, 2019 12:15 am

Re: Polydentates

Postby 205296774 » Mon Dec 02, 2019 7:54 pm

I think that CO3 2- would actually be monodente or bidente, not tridente. This is because the structure (Trigonal Planar) doesn't allow the 3rd oxygen to reach around and bind to the transition metal. This also applies to Oxalate: the C bound to another carbon and two oxygens makes a trigonal planar shape, so if the TM is on one side, the opposite sided oxygens can't reach around.

Basically, if the shape is linear or planar, atoms on the opposite side of the TM may not be able to reach. However, if the shape is not planar or if there is a string of molecules, it most likely will be able to bind multiple times.


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