Abstract
Endohedral metallofullerenes (EMFs) with a composition of M2C2n may exist as di-EMFs, M2@C2n, or as carbide cluster metallofullerenes (CCMFs), M2C2@C2n-2. Although metals with a small ionic radius such as scandium were found to form cluster EMFs and some have been incorrectly assigned as conventional EMFs.[1-3] , Lu-containing EMFs remain largely unexplored in spite that lutecium has a similar ionic radius to that of scandium. In this work, we report the isolation and single-crystal X-ray crystallographic characterization of several unprecedented Lu- containing EMFs: Lu2@C2n (2n=82, 84, 86) EMFs. Theoretical results demonstrate that four electrons are transferred from the two divalent Lu ions onto the fullerene cages. References： (1) Lu, X.; Akasaka, T.; Nagase, S. Acc. Chem. Res. 2013, 46 (7), 1627. (2) Lu, X.; Feng, L.; Akasaka, T.; Nagase, S. Chem. Soc. Rev. 2012, 41 (23), 7723. (3) Popov, A.; Yang, S.; Dunsch, L. Chem. Rev. 2013, 113, 5989-6113.
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