After successfully induced skeleton rearrangement through atom manipulation to generate linear carbon chains with terminated benzene rings in 2018 , Kaiser and co-workers realized, for the first time, the gen and characterization of the cyclocarbon consisting of 18 doubly coordinated carbon atoms, known as cyclo carbon (C 18 ), using the similar technology . Due to its novel geometric configuration and special electronic structure, large numbers of theoretical studies on this allotropic carbon have been reported successively since it was prepared experimentally . However, the high activity makes C 18 molecule has not been stably isolated so far , which becomes an unavoidable obstacle for its practical application in functional materials.