ABSTRACT
This chapter reviews charge transfer (CT) complex interaction as one of weak no covalent bonds for application not only in electronic fields but also in biofields. This interaction of small molecule has inspired chemists and students to explore new concepts such as CT mechanisms and new materials of several fields such as electronic, super molecular and biological materials. It reviews in detail how to prepare and observe organic CT complexes and studies and applications of the use of organic CT interactions between donors and acceptors. In accordance with molecular orbitals, the CT band results in an electronic transition from the highest occupied molecular orbital (HOMO) of the donor to the lowest unoccupied molecular orbital (LUMO) of the acceptor Formation of a CT complex. This can be readily appeared as a new single or multiple low-energy absorption bands, while the absorption peaks of the individual donor and acceptor components significantly remain.
