The field of bioinorganic chemistry, which deals with the study of the role of metal complexes in biological systems, has opened a new horizon for scientific research in coordination compounds. many compounds are important from the biological point of view. Some metals are essential for biological functions and are found in enzymes and cofactors required for various processes. For example, hemoglobin in red blood cells contains an Iron porphyrin complex which is used for oxygen transport and storage in the body.