Charge-transfer in a pi-stacked fullerene porphyrin dyad: evidence for back electron transfer in the 'Marcus-inverted' region

The 'Marcus-inverted' region for BET in a pi-pi stacked fullerene-porphyrin dyad was determined based on (i) the photoactivation of an intramolecular ET in a variety of solvents and (ii) the formation of a highly energetic charge-separated state.