Coordination complexes are molecules that possess a metal center bound to atoms, ions, or molecules (ligands) that donate electrons to the metal. The importance of coordination chemistry for the new MCAT derives from the common occurrence of metals as cofactors for many enzymes and other proteins such as hemoglobin. Understanding how the availability of the d subshell of transition metals for electron exchange in catalysis or electron transfer processes such as in cytochromes and iron-sulfur complexes is one of the most important insights to gain in biochemistry. Another aspect of coordination chemistry for focus is the behavior polydentate ligands in living systems (λ-carboxy glutamate in blood clotting) and on the molecular biology benchtop (EDTA).
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Conceptual Vocabulary for Coordination Chemistry