What is the importance of coordination compounds in biological systems?

Coordination compounds play a crucial role in biological systems. For example, hemoglobin is a coordination compound where the central metal ion is iron (Fe²⁺) and it is surrounded by nitrogen atoms from the heme group. Hemoglobin is responsible for the transport of oxygen in the blood. Another example is chlorophyll, which is essential for photosynthesis in plants and contains magnesium (Mg²⁺) as the central metal ion. These examples highlight the importance of coordination compounds in vital biological processes.