In the past two years, various theoretical studies involving the properties, behaviors, and potential applications of C 18 and its analogues and derivatives have been carried out by several research groups. Among these, the theoretical design of supramolecular complex by Jiang et al. showed that C 18 can be hosted inside the [11]CPP through intermolecular π-π interaction, emphasizing the potential of C 18 as a building block to construct molecular devices by residing in carbon materials of suitable size and shape.