Pi-Conjugated Molecule Based Supramolecular Nanofibers Whose Structures and Functions Can Be Reversibly Switched by External Stimuli

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Supramolecular nanofibers (SNFs) composed of pi-conjugated molecules exhibit attractive optical and electrical properties, which are attributed to their high-aspect-ratio morphology. Generally, such SNFs have been constructed with molecules that have flexible long chains in the periphery. However, such flexibility often causes molecular disorder that decreases the functionality of SNFs. On the other hand, we successfully achieved crystalline SNFs with dehydrobenzoannulene derivatives that have two methyl ester groups at non-centrosymmetric positions. Moreover, we found that the SNF experiences structural transformation with keeping its fibrous morphology upon irradiation of ultrasound. Interestingly, the transformation brings drastic changes of a charge carrier behavior of the SNF.