The following table gives some of the important bio coordination compounds. (i) Coordination compounds are of great importance in biological systems. According to management experts, coordination is necessary because: "Coordination is the Essence of Management."I.e. ; Coordination is a principle of management, and all other principles are included in this one principle, i.e. Haemoglobin Transport and storage of oxygen . Coordination complexes can undergo a variety of reactions, including electron transfer, ligand exchange, and associative processes. e.g., Potassium ferrocyanide, K 4 [Fe(CN) 6]. It is a tribute to clever coordination chemistry that gram quantities of potentially toxic gadolinium ions can be safely injected into a patient undergoing an MRI scan, in fact into millions of patients each year. The pigment responsible for photosynthesis, chlorophyll, is a coordination compound of magnesium. Key Terms. Coordination compounds play important roles in nature. 1. Chemistry Notes for class 12 Chapter 9 Coordination Compounds Coordination compounds are those addition molecular compounds which retain their identity in solid state as well as in dissolved state. What Is A Coordination Compound? Hemoglobin, the oxygen transporter in the human body, is a coordination complex of iron. This pigment is a coordination compound of magnesium. For example, the oxygen-carrier of blood, i.e., haemoglobin, is a coordination compound of iron. The Coordination compounds are also used as catalysts for several biological and industrial processes having much importance in the qualitative and quantitative chemical analysis within the field of analytical chemistry. The Ca 2+ and Mg 2+ ions form stable complexes with EDTA. (ii) Role of coordination compounds in medicinal chemistry: Chlorophyll , which is involved in photosynthesis in plants, is a coordination complex of magnesium. A coordination complex is the product of a Lewis acid-base reaction in which neutral molecules or anions (called ligands) bond to a central metal atom (or ion) by coordinate covalent bonds.. Ligands are Lewis bases - they contain at least one pair of electrons to donate to a metal atom/ion. The definitions of some important terms in the chemistry of coordination compounds can be found below. ; Metals can be purified by the formation and subsequent decomposition of their coordination compounds. Importance and Application of Coordination Compounds: EDTA is used in the estimation of Ca 2+ and Mg 2+ in hardwater. In the human biological system, several coordination compounds play important roles. Among them, coordination compounds also play a key role in serving humanity as these compounds have a wide range of applications in health care from antimicrobial to anticancer, bioengineering, bio-mimetic models, catalysis, photosensitized materials etc. Ligands are also called complexing agents. Coordination Entity A chemical compound in which the central ion or atom (or the coordination centre) is bound to a set number of atoms, molecules , or ions is called a coordination entity . In these compounds. redox: A reversible chemical reaction in which one reaction is an oxidation and the reverse is a reduction. Haemoglobin, the red pigment 1 of blood which acts as oxygen carrier is a coordination compound … coordination: The reaction of one or more ligands with a metal ion to form a coordination compound. 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