[DBU]C60 - SPIN PAIRING IN A FULLERENE SALT

The treatment of C60 with the tertiary amine 1,8-diazabicyclo [5.4.0]u ndec-7-ene results in the formation of a diamagnetic zwitterion salt [ DBU]C60. This addition reaction was monitored in solution by UV/VIS/NI R and ESR spectroscopy. It is shown that in the first step a single el ectron transfer occurs leading to the C60-. monoradical anion and the DBU radical cation. In a subsequent step [DBU]C60 is formed upon a rad ical recombination process. The represented results give evidence for the reaction mechanism of nucleophilic amine additions to C60 proposed earlier.