Fullerene Wires Assembled Inside Carbon Nanohoops

Carbon‐nanohoop structures featuring one or more round‐shaped cavities represent ideal supramolecular hosts for spherical fullerenes, with potential to form host‐guest complexes that perform as organic semiconductors in the solid state. Due to the tight complexation between the shape‐complementary hosts and guests, carbon nanohoops have the potential to shield fullerenes from water and oxygen, known to perturb the electron‐transport process. Many nanohoop receptors have been found to form host‐guest complexes with fullerenes. However, there is only a little or no control over the long‐range order of encapsulated fullerenes in the solid state. Consequently, the potential of these complexes to perform as organic semiconductors is rarely evaluated. Herein, we present a survey of all known nanohoop‐fullerene complexes, for which the solid‐state structures were obtained. We discuss and propose instances where the inclusion fullerene guests form discrete supramolecular wires, which might open up possibilities for their use in electronic devices.