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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?
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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