What are chelate metal ions??

Dear Student,

When a di-or poly-dentate (ligands which have two donor atoms are called di-dentate and ligands which have more than two donor atoms are called poly-dentate ligands),  ligand uses its two or more donor atoms to bind the same central metal atom or ion, it is called chelation. The resulting complex has ring structures and the ligand coordinating through two or more donor groups is called chelating ligands. Some common example of chelating ligands are:

Carbonate ion, oxalate ion (ox2-), ethylenediamine (en) etc.

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A chelate is a chemical compound composed of a metal ion and a chelating agent. A chelating agent is a substance whose molecules can form several bonds to a single metal ion. In other words, a chelating agent is a multidentate ligand.
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