Covalently chemical modification of lithium ion-encapsulated fullerene: synthesis and characterization of [Li+@PCBM]PF6(-).

Covalently organic derivatization of [Li+@C60]PF6– to obtain Li+-encapsulated PCBM, [Li+@PCBM]PF6–, is described. Synthetic procedures, electrochemical properties, light absorption properties, details of isomerization from [5,6]- to [6,6]-isomer, and X-ray crystal structure of [Li+@PCBM]PF6– are discussed.