title: Synthesis and photoinduced intramolecular processes of fulleropyrrolidine-oligothienylenevinylene-ferrocene triads.
abstract: Two new triads based on N-methylfulleropyrolidine, oligothienylenevinylenes (nTV) and ferrocene (Fc), namely C(60)-nTV-Fc (n=2, 4) have been synthesized. A HOMO-LUMO gap as low as 1.09-1.11 eV was experimentally determined by cyclic voltammetry. In both polar and nonpolar solvents, photoinduced charge-separation (CS) processes in C(60)-nTV-Fc predominantly take place from the singlet excited states of C(60) and nTV; this result was indicated by steady and time-resolved emission spectroscopy. In the case of C(60)-4TV-Fc, the CS state was indicated by the nanosecond transient absorption spectra. In C(60)-2TV-Fc, although the CS process was also confirmed by the fluorescence quenching in nonpolar and polar solvents, the lifetimes of the CS states were shorter than those of C(60)-4TV-Fc. It was revealed that the introduction of Fc donor moiety at the end of the longer nTV chain in the C(60)-nTV dyad systems effectively increases the CS efficiency and the lifetimes of CS states.
authors.affiliation: Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, 45071 Toledo, Spain.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Oswald
authors.forename: D-M Shafiqul
authors.initials: DM
authors.lastname: Islam
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Araki
authors.forename: Vincent
authors.initials: V
authors.lastname: Troiani
authors.forename: Pilar
authors.initials: P
authors.lastname: de la Cruz
authors.forename: Andrés
authors.initials: A
authors.lastname: Moreno
authors.forename: Osamu
authors.initials: O
authors.lastname: Ito
authors.forename: Fernando
authors.initials: F
authors.lastname: Langa