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Synthesis and photoinduced energy- and electron-transfer processes of C60-oligothienylenevinylene-C70 dumbbell compounds
Authors:Urbani Maxence  Pelado Beatriz  de la Cruz Pilar  Yamanaka Ken-ichi  Ito Osamu  Langa Fernando
Institution:Instituto de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), Universidad de Castilla-La Mancha, 45071-Toledo, Spain.
Abstract:Unsymmetric dumbbell molecules based on N-methylpyrrolidine60]fullerene, oligothienylenevinylenes (nTV; n=2, 4), and N-methylpyrrolidine70]fullerene, namely, C(60) -nTV-C(70) were synthesized and their photophysical properties were studied. In nonpolar solvents, photoinduced energy-transfer process predominantly takes place from the singlet excited state of nTV to C(60) and C(70) , as was confirmed by time-resolved emission and transient absorption spectroscopy. In polar solvent, charge-separation processes take place instead of energy transfer. The generated charge-separated radical-ion pairs decay to the neutral molecules by a fast charge-recombination process; for n=4, a rate constant of 2×10(7) s(-1) and lifetime of 50 ns were evaluated.
Keywords:charge transfer  electrochemistry  fluorescence  fullerenes  oligothienylenevinylenes
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