Cycloncarbons
Cycloncarbons are a class of carbon-rich cyclic molecules composed entirely of carbon atoms arranged in closed rings. The term covers cyclocarbons with ring sizes ranging from small to large, where the carbon lattice can incorporate segments that resemble cumulenes (alternating double bonds) or polyynes (alternating single and triple bonds). The hallmark is a carbon ring with no heteroatoms, though stabilized derivatives or metal coordination can aid isolation and study.
Structure and bonding are diverse within cycloncarbons. In smaller rings, high ring strain and the involvement
Synthesis and characterization have progressed through advances in both on-surface chemistry and solution chemistry. Historically, cycloncarbons
Properties and potential applications of cycloncarbons include high strain energies and a range of electronic behaviors