Pentiptycene‐Derived Oligo(p‐phenyleneethynylene)s: Conformational Control, Chain‐Length Effects, Localization of Excitation, and Intrachain Resonance Energy Transfer

Do the twist: The preference of large pentiptycene–pentiptycene dihedral angles and the restricted torsional relaxation for pentiptycene-derived oligo (p-phenyleneethynylene)s in a 2-methyltetrahydrofuran glass at 80 K result in a localized excited state. These results demonstrate not only the concept of torsion-induced localization of excitation but also the efficient intrachain energy hopping processes in conjugated polymers.