Tumbling Cerium Atoms Inside the Fullerene Cage: iCe2C80

We report the spectroscopic work of two Ce‐containing incar‐fullerenes, iCeC82 and iCe2C80. UV/Vis, IR, Raman, TOF‐MALDI and 13C NMR were employed to investigate the structural and electronic information of these two major isomers of Ce incar‐fullerenes. Tumbling motion of two Ce atoms inside the Ih‐C80 cage was confirmed and analysed by temperature‐dependant 13C NMR.