Thieno[3,4-d]imidazolium-containing Molecular Wire: Switching Behavior of Photoinduced Intramolecular Electron Transfer

Abstract Zinc–porphyrin–oligothiophene–fullerene triad, where diethynylthieno[3,4-d]imidazolium is incorporated as a central unit of oligothiophene, has been synthesized. A dramatic enhancement of fluorescence from the zinc–porphyrin unit was observed on displacing counter anion from I− to F− in the imidazolium salt, indicating that photoinduced intramolecular electron transfer is controllable by the electronic perturbation to this unit.