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According to my notes, a chelate complex is a complex containing ligands that form a ring of atoms that include the central metal atom. Chelating ligands can bind cations really tightly, therefore such complexes such as EDTA, is good at removing metals from solution because the metal ion is bounded tightly with the chelating ligands.
Another thing to note is that these molecules may have the ability to envelope transition metals in such a way due to the presence of sigma bonds which allow rotation of molecules. This allows molecules to bind to others in multiple places.
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