Mulliken’s Theory in Charge-Transfer Complexation
Keywords:acceptor, biochemical, electron, energy, molecules, solvent, transfer
The nature of the attraction in a charge-transfer complex is not a stable chemical bond and is much weaker than covalent forces, rather it is better characterized as a weak electron resonance. As a result, the excitation energy of this resonance occurs very frequently in the visible region of the electro-magnetic spectrum. This produces the usually intense colors characteristic for these complexes. The optical absorption bands are often referred to as charge-transfer bands, or CT bands. Therefore optical spectroscopy is a powerful technique to characterize charge-transfer bands.The CT-complexes extend from hydrogen bonding to proton transfer reactions including solvent polarity scales based on them. These complexes are becoming increasingly important in all fields of human endeavour from physics and chemistry and biology to medicines. Currently there is an opinion among some scientists that these complexes are involved somewhere or the other on the reaction profile of all chemical reactions. They are, therefore, a special case of molecular association and have been most widely investigated. Charge transfer complexes are of immense importance in material science and they play a significant role in drug design and bioelectrochemical processes.
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