chelating vs. polydentate?

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chelating vs. polydentate?

Postby claudia_1h » Sat Dec 07, 2019 1:32 pm

What is the difference between the definition of a chelating ligand and a polydentate ligand? Doesn't being polydentate (bonding to the Tx metal at more than one place) automatically form a "ring" and make it chelating?

Jacob Puchalski 1G
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Re: chelating vs. polydentate?

Postby Jacob Puchalski 1G » Sat Dec 07, 2019 1:35 pm

I think it's just that polydentate ligands happen to form a chelate with the central atom.

Sofia Barker 2C
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Re: chelating vs. polydentate?

Postby Sofia Barker 2C » Sat Dec 07, 2019 7:12 pm

You are correct. Chelation results from a polydentate ligand binding to a transition metal. A polydentate ligand is able to form a chelate, and a chelating ligand is polydentate, so they are essentially equivalent. Chelating specifically refers to the ring structure formation around a transition metal, but polydentate ligands can form that structure as well.

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