Bis[1,2,5]thiadiazlo-p-quinobis(1,3-dithiole) (BTQBT) (3a) and its derivatives 3b-f were prepared by using a Wittig-Horner reaction. The conductivity of BTQBT was good as a single component. The X-ray structural analysis reveals that the planar molecule forms a sheetlike network by short S---S contacts. The conductivities of the derivatives 3b-f were poorer than that of BTQBT, indicating that the unique crystal structure of BTQBT is needed for the good conductivity. The selenadiazolo analogues 9a,b were also prepared. The conductivities were a little higher than that of BTQBT due to the stronger intermolecular interactions caused by the selenium atom.
Yamashita, Yoshiro; Tanaka, Shoji; Tomura, Masaaki, Phosphorus, Sulfur and Silicon and the Related Elements, 1992, vol. 67, # 1-4, p. 327 - 332