C-60-based triads with improved electron-acceptor properties: Pyrazolylpyrazolino[60]fullerenes

A series of triad pyrazolylpyrazolino[60]fullerenes has been prepared in on e pot from suitably functionalized hydrazones by 1,3-dipolar cycloaddition reactions under microwave irradiation. The electrochemical properties of th e compounds obtained were investigated by cyclic voltammmetry, and they sho w better electron acceptor character than the parent C-60 in all cases. Flu orescence experiments and time-resolved transition spectroscopy indicate th e existence of photoinduced charge-transfer processes with the C-60 triplet acting as the acceptor.