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Four oxide clusterfullerenes Ho 2 O@C 90  (I–IV) were prepared by a modified arc discharge method and isolated by a multistage high performance liquid chromatography procedure. Based on their vis-NIR spectra, the carbon cage symmetries in Ho 2 O@C 90  (I, III, IV) are confirmed to be  C 2 (43)-C 90 ,  C 2 (40)-C 90  and  C 2 (41)-C 90 , respectively. Electrochemical studies display that the first and second reduction potentials of Ho 2 O@C 90  isomers are close to those of Er 2 C 2 @C 90  ones, but much lower than those of Sm@C 90  ones. Moreover, it is found that the electrochemical band gaps of Ho 2 O@C 90  isomers are also very close to those of Er 2 C 2 @C 90  isomers. A detailed investigation on the redox potentials of C 90  based EMFs reveals that endohedral clusters/atoms have much greater effect than carbon cage symmetries on the electrochemical properties of EMFs.

Isolation and Electrochemical Property of Ho2O@C90 Isomers

Isolation and Electrochemical Property of Ho₂O@C₉₀ Isomers