Studies on synthesis of 5,5'-distyryl-2,2'-bithiophene derivatives and their optical and electrochemical properties

抄録

Pi-Conjugated bithiophene derivatives are expected to show remarkable optical and electrochemical properties owing to the characteristic electronic state. Recently, we reported that Pd-catalyzed C-H homocoupling of thiophene derivatives smoothly occurred in the presence of AgN03 and KF, and the corresponding bithiophene derivatives were obtained in high yields. In this study, the re-conjugated bithiophene derivatives having aryl groups symmetrically through carbon-carbon double bonds were synthesized by the C-H homocoupling reaction and Wittig reaction. In order to clarify the influence of terminal functional groups to physical properties, energy gaps were estimated from the onset of absorption in the UV -vis spectrum and quantum yields of fluorescence were calculated on the basis of fluorescence spectra. Furthermore, standard oxidation potentials were determined by cyclic voltammetry and the electron properties were calculated by density functional theory method.