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Reactivity of Open-Shell Metallofullerene Anions: Synthesis, Crystal Structures, and Electrochemical Properties of Benzylated Gd@C2v-C82

Xinyi Zhou,Yang-Rong Yao,Yajing Hu,Le Yang,Shaoting Yang,Yilu Zhang,Qianyan Zhang,Ping Peng,Peng Jin,Fang-Fang Li

The reactivity of the open-shell Gd@C2v-C82with different charge states towards benzyl bromide was investigated. [Gd@C2v-C82]3−exhibited enhanced activity relative to Gd@C2v-C82and [Gd@C2v-C82]−. The structural characterizations, including MALDI-TOF MS, UV-vis-NIR, and single crystal X-ray diffraction, indicate the formation of isomeric benzyl monoadducts of Gd@C2v-C82. All three monoadducts contain 1:1 mirror-symmetric enantiomers. Additionally, the addition of the benzyl group and its specific position result in distinct electrochemical behavior of the products compared to the parent Gd@C2v-C82. Theoretical studies demonstrate that only [Gd@C2v-C82]3−has a HOMO energy level that matches well with the LUMO energy level of the PhCH2radical, providing a rationalization for the observed significantly different reactivity.Keywords:endohedral metallofullerene;open shell;electrosynthesis;fullerene anion;Gd@C2v-C82