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| organic chemistry | |
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| organic semiconductors | |
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The interaction between donor and acceptor is not only a charge transfer interaction but also Electrostatic Force and sometimes interaction. The interaction between donor and acceptor is usually much weaker than interactions of the Hydrogen Bond and the Covalent Bond , but it is useful for constructing Crystal Structures . In 1962, a famous acceptor, tetracyanoquinodimethane (TCNQ), was exploited and in 1970, a famous donor, tetrathiafulvalene (TTF), was synthesized. In 1973, a CT complex composed of the TTF and TCNQ was discovered; it was the first organic Conductor . In a crystal of TTF-TCNQ, the TTF and TCNQ are stacked independently and an electron transfer from donor (TTF) to acceptor (TCNQ) occurs. Hence, electrons and Holes can transfer in the TCNQ and TTF columns, respectively. In 1980, the first organic molecule that was also a and 12 k Bar . Since 1980, many organic superconductors have been synthesized, and the critical temperature has been raised to over 100 K as of 2001. CT complexes have many useful aspects and much more amazing properties are expected to be discovered. EXAMPLES Hexaphenylbenzene s like H (fig. 1) lend themselves extremely well to forming charge transfer complexes. Cyclic Voltammetry for H displays 4 well separed maxima corresponding to H+ right up to H4+ with the first ionization at E1/2 of only 0.51 EV . Oxidation of these Arene s by for instance Dodecamethylcarboranyl ('''B''') to the blue crystal solid H+B- complex is therefore easy . The Phenyl groups are all positioned in an angle of around 45° with respect to the central aromatic ring and the positive charge in the Radical Cation is therefore Through Space Delocalised through the 6 benzene rings in the shape of a Toroid . The complex has 5 absorption bands in the Near Infrared region which can be assigned to specific Electronic Transition s with the aid of Deconvolution and the Mulliken-Hush Theory . SEE ALSO REFERENCES |
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