D. Bonifazi, M. Scholl, F. Song, L. Echegoyen, G. Accorsi, N. Armaroli, F. Diederich,
Angew. Chem., Int. Ed. 2003, 42, 4966-4970
Up to fifteen electrons are reversibly accommodated in a triply fused porphyrin dimer conjugated to two fullerene moieties. Its photophysical properties differ completely from those of the many known porphyrin–fullerene dyads: Photoexcitation of the C60 moieties results in quantitative sensitization of the low-lying (about 1 eV) and very short lived lowest singlet level of the porphyrin sheet (see scheme).