Synthesis, structure, and physical properties of novel component molecules with fused heterocycles for organic conductor

Novel unsymmetrical tetrathiafulvalene derivatives with a fused 1,2,5-thiadiazole ring have been synthesized. The room temperature electrical conductivities of their 1:1 radical cation salts were found to lie between 10−6 and 10−1 S cm−1. The X-ray crystallographic analyses of the radical cation salts revealed that there exist short intermolecular S…N and S…S heteroatom contacts in the crystals.