When the starting material is endohedralfullerene, which is C60 encapsulating one or more atoms, the resulting C120 will contain one or more atoms in C60 cages. Because amounts of the available endohedralfullerenes are very small, a mixture of hollow C60 and endohedralfullerenes was used for the synthesis. Thus, only one of the two C60 cages of reported endohedral fullerene dimers contains an atom. The reported endohedral fullerene dimers are 3He @ C120  and [email protected] . The encapsulated 3He and N atoms can be used as labeling because the environment of the 3 He and N atoms in the dimers can be monitored by 3He-NMR (nuclear magnetic resonance) and electron paramagnetic resonance (EPR), respectively.
Scheme 1. Possible mechanism of formation of Cr
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