Abstract The syntheses and the electronic properties of oligo (2, 7-biphenylenylene-(E)- vinylene) s are reported. According to our spectral analysis, a limit of 2.5 ev for the peak band-gap of poly (2, 7-biphenylenylene-(E)-vinylene) s is estimated. In addition, we discovered that oligo (2, 7-biphenylenylene-(E)-vinylene) s are amphoteric and can be either oxidized or reduced electrochemically.
