Write the biologically importance of coordination compounds.

Explanation

Biological important of coordination compounds:
(i) A red blood corpuscles (RBC) is composed of heme group, which is `Fe^(2+)`- Porphyrin complex. It plays an important role in carrying oxygen from lungs to tissues and carbon dioxide from tissues to lungs.
(ii) Chlorophyll, a green pigment present in green plants and algae, is a coordination complex containing `Mg^(2+)` as central metal ion surrounded by a modified Porphyrin ligand called corrin ring. It plays an important role in photosynthesis, by which plants converts `CO_(2)` and water into carbohydrates and oxygen.
(iii) Vitamin `B_(12)` (cyanocobalamine) is the only vitamin consist of metal ion. It is a coordination complex in which the central metal ion is `Co^(+)` surrounded by Porphyrin like ligand.
(iv) Many enzymes are known to be metal complexes, they regulate biological processes. For example, Carboxypeptidase is a protease enzyme that hydrolytic enzyme important in digestion, contains a zinc ion coordinated to the protein.