Electrical Conductivities of the Complexes of Naphthaceno[5,6-cd:11,12-c′d′]bis[1,2]dithiole and Its Analogs Obtained by Electrochemical Crystallization and Diffusion Method

Electrochemical crystallizations of the complexes of naphthaceno[5,6-cd: 11,12-c′d′]bis[1,2]dithiole (TTT), anthra[1,9-cd:4,10-c′d′]bis[1,2]dithiole (TTA), anthra[1,9-cd:4,10-c′d′]bis[1,2]diselenole (TSA), and naphtho[1,8-cd:4,5-c′d′]bis[1,2]dithiole (TTN) were made in 1,1,2-trichloroethane or tetrahydrofuran as a solvent. Most of the crystals were obtained with non-stoichiometric compositions, and they included the solvent. Some charge-transfer complexes including the above donors were also made by a diffusion method. The electrical conductivities of the crystals were measured by a two-probe or four-probe method. TTT(PF6)0.61 was found to be the most conductive materials in the complexes studied. Its electrical conductivity was 762 (Ω cm)−1 at room temperature, and it showed metallic behavior above 220 K. The conductivities of the other complexes varied widely in the range 102–10−7 (Ω cm)−1.