Fig. 1: The design of heteroatom-bridged molecular belts.

a Example of singly bridged macrocycle ([9]cycloparaphenylene), double-stranded molecular belt (carbon nanobelt), and the proposed structure of cyclacenes. b The features of phenoxathiin as a building block for constructing molecular belts. c The heteroatom(S,O)-bridged molecular belts (cyclo[8]phenoxathiins) report in this work.