Chemical and Physical Properties of Cation Radical Salts of BEDT-TTF

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Abstract
Extension of TTF skeleton by alkylthio groups makes the donors superior even to TMTSF concerning ionization potential, polarizabi1ity, and on-site Coulomb repulsion. Furthermore, due to the presence of the outer sulfur atoms, BEDT-TTF can form two-dimensional network by side-by-side arrangement in the complexes. The balance between the face-to-face and side-by-side interactions results in a variety of polymorphic complexes. We have been studying chemical, physical, structural, and designing works of cation radical salts of BEDT-TTF compounds. (BEDT-TTF) 2ClO4. (TCE).0.5 shows metallic character down to 1.4Kwith phase transitions at ca. 170K and 15K in electrical conductivity. The ESR and static magnetic studies show additional phase transitions. Different temperature dependence of magnetic properties was observed in the relaxed and quenched samples of this salt. A magnetic phase below 20K was formed by relaxing the salt at high temperature.