U@C36. Is there enough room for a second uranium?†
The feasible obtention of U2@C36 as a small endohedral bimetallofullerene is evaluated. Our analysis indicates that U2@C36 is a plausible candidate with a U–U bond length of 2.27 Å. The current observation opens the quest for the hypothetical prediction of other small endohedral bimetallofullerenes and their possible experimental characterization.