Abstract

Abstract Two new organic electron donor molecules are synthesized on the basis of the ethylthio-substituted tetrathiapentalenes with a methylenedithio or a 1,3-dithiane unit. These donors provide four isostructural radical-cation salts, which belong to a new crystal type with uniform stacks of the donor molecules. These salts show metallic conductivity down to low temperatures, linear temperature dependence of the thermoelectric power, and asymmetrical ESR lineshapes. The obtained uniform structure is compared with the previous uniform structure from the viewpoint of crystal packing.

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