Charge-transfer complexes with other organic systems

CHARGE-TRANSFER COMPLEXES WITH OTHER ORGANIC SYSTEMS... 

In this review article, conductivity and superconductivity in doped fullerenes are described with reference to important literature. The review covers the geometry of the fullerenes (Cgo and tubules), and the structure of their solids before and after doping, being followed by the electronic properties found in fullerenes and doped fullerenes. Conductivity and superconductivity of alkali-metal C o (AxC o, here A is the alkali-metal and X can generally vary from 1 to 6) fullerides are discussed and compared with those encountered in conventional conductors and superconductors. The formation of charge-transfer complexes of C o with other organic systems and structural/physical properties reported for them are also discussed. Lowdimensional polymer phases made in the stoichiometry... 

Complexation in its various forms plays a key role in the homo- and copolymerization of 1-alky 1-4-vinylpyridinium ions. Intermonomer associations are believed responsible for the enhanced poly-merizability of monomers with long alkyl chains (C , n > 6) on nitrogen, the ability of the title monomers to copolymerize with anionic and Ti-rich monomers, and the strong dependence on concentration for homopolymerization of all these cationic monomers. Hydrophobic interactions between lipophilic monomers, electrostatic attraction between cationic and anionic monomers, and charge-transfer complexation between Ti-rich and Ti-deficient monomers have all been observed to control polymer formation. Monomer organization/orientation on polyanion templates, at organic solvent-water interfaces and in ordered multiple-phase systems such as micelles, membranes, vesicles, and microemulsions have been used with limited success in attempts to control the microstructure (e.g. tacticity, monomer sequence) in the related polymers. Interpolymer complexes of poly(l-alky 1-4-vinylpyridinium ions) with natural and synthetic poly anions represent a rich resource for the development of selective electroanalytical methods, for efficient new separation procedures, for manipulation of biomembranes in drug dehvery, and numerous other applications. 

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