monodentate vs bidentate

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lauraxie2e
Posts: 82
Joined: Fri Aug 09, 2019 12:17 am

monodentate vs bidentate

Postby lauraxie2e » Wed Dec 04, 2019 3:26 pm

What is the cut off for the degrees Is for being able to act as a monodentate and bidentate ligand? For example in 9C5, I was told that CO3^2- is monodentate because the angle between the oxygens is only 120 degrees which is too small to bind to the same metal, but then it is also bidentate because it has two spots where it binds to two different metals?

sarahsalama2E
Posts: 143
Joined: Fri Aug 30, 2019 12:16 am

Re: monodentate vs bidentate

Postby sarahsalama2E » Thu Dec 05, 2019 12:55 am

I think a good way to go about these problems when you are trying to see what kind of polydentate a particular ligand is, is to first draw the lewis structure. If you see that the two attachments are on roughly the same side, then it can be bidentate, etc.. If you can visualize the ligand acting as a "pincer" of sorts and chelating to the metal atom, then it is polydentate.


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