| Popis: |
This chapter reviews the most important theories that helped in understanding the nature of bonding, magnetic properties, and electronic structures of metal complexes. Coordination complexes bring color to the otherwise usually colorless chemical compounds that have been known for centuries, and make them special topic to study and understand. There are three main theories: valence bond theory (VBT), crystal field theory (CFT), and molecular orbital theory (MOT). These can explain the color, magnetic properties, and bonding nature of complex compounds. Each theory is based on assumptions, with advantages and disadvantages. For example, VBT is simple and efficient to understand the basic structure of the molecule but it fails to explain the color and the varied magnetic properties of complexes. CFT is based on the ionic nature of complexes and it ignores the covalent character present in the metal complexes. The most recent and complete theory (MOT) emerged to answer the shortcomings of VBT and CFT. The MOT emphasizes the need to consider both ionic and covalent aspects of metal complexes. |
