Polydentate Ligand

A ligand that has more than one atom that coordinates directly to the central atom in a complex.

Polydentate ligands are called chelating agents when two or more coordinating atoms are attached to the same metal ion in a complex.

Example: EDTA or ethylenediaminotetracetic acid is a hexadentate ligand of calcium ion.

See also: Ligand.

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Subjects: Chemistry