Chelate

Definition

Chelate is a complex formed when a single ligand binds to a central metal atom at multiple points. This creates ring-like structures that enhance the stability of the complex.

5 Must Know Facts For Your Next Test

1. Chelating ligands are also known as multidentate ligands because they have multiple binding sites.
2. The stability of chelate complexes is generally higher than that of similar non-chelated complexes, a phenomenon known as the 'chelate effect.'
3. Common examples of chelating agents include EDTA (ethylenediaminetetraacetic acid) and hemoglobin in blood.
4. Chelation therapy can be used in medicine to remove heavy metals from the body.
5. The term 'chelate' comes from the Greek word 'chele,' meaning claw, which reflects how the ligand appears to grasp the metal ion.

Review Questions

Related terms

Ligand:

An atom, ion, or molecule that donates at least one pair of electrons to form a coordinate bond with a central metal atom or ion.

Coordination Number:

The number of ligand donor atoms to which the central metal atom or ion is directly bonded.

Chelate Effect: The increased stability of coordination compounds containing chelate rings compared to similar compounds with monodentate ligands.