Isolation and Characterization of Sc₂C₂@C₆₈: A Metal‐Carbide Endofullerene with a Non‐IPR Carbon Cage

Abstract

Breaking the rule: The metal-carbide endofullerene Sc2C2@C68 was isolated and characterized (see picture). It has a valence state (Sc3+)2(C2)2−@C684−, and its carbon cage does not comply with the isolated-pentagon rule (IPR). This result, in combination with previous work on Sc3N@C68, shows that different non-IPR C68 cages can be synthesized by using different endohedral clusters as templates.