title: Synthesis and photoinduced energy- and electron-transfer processes of C60-oligothienylenevinylene-C70 dumbbell compounds.
abstract: Unsymmetric dumbbell molecules based on N-methylpyrrolidine[60]fullerene, oligothienylenevinylenes (nTV; n=2, 4), and N-methylpyrrolidine[70]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.
authors.affiliation: Instituto de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), Universidad de Castilla-La Mancha, 45071-Toledo, Spain.
authors.forename: Maxence
authors.initials: M
authors.lastname: Urbani
authors.forename: Beatriz
authors.initials: B
authors.lastname: Pelado
authors.forename: Pilar
authors.initials: P
authors.lastname: de la Cruz
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Yamanaka
authors.forename: Osamu
authors.initials: O
authors.lastname: Ito
authors.forename: Fernando
authors.initials: F
authors.lastname: Langa