Abstract
We have synthesized unsubstituted oligothiophenes with both terminal thiophene rings linked at β-positions. The correlation between molecular structure, character of a single molecule such as conjugation length, and physical properties as solid has been investigated. Moreover, the influence on electric properties of their thin films has been investigated. It was revealed that π-conjugation length of the molecule considerably influences the field-effect transistor characteristic.
Acknowledgments
We thank Mr. J. Chisaka for his guidance in thin-film preparation and characterization. We also appreciate Drs. T. Kimura and M. Misaki for their guidance in DSC analysis.