The Diels–Alder adduct of C60 and 4,5‐dimethoxy‐o‐quinodimethane—synthesis, crystal structure, and donor–acceptor behavior

Covalent linking of C60 to electron donors is expected to create attractive substrates for the study of electron or energy transfer. The successful synthesis of a 4,5‐dimethoxy‐o‐quinodimethane‐C60 adduct is described. The unique crystal structure has been determined and the bandgap measured by ESCA. One of the most interesting features of the crystal structure of the mono‐adduct is the close contact of one of the methoxy groups to a neighboring C60, leading to the formation of a chain of interacting fullerene cages.