title: Synthesis and photophysical properties of a [60]fullerene compound with dimethylaniline and ferrocene connected through a pyrazolino group: a study by laser flash photolysis.
abstract: Pyrazolino[60]fullerene covalently-linked to ferrocene and N,N-dimethylaniline groups has been prepared and studied using time-resolved spectroscopic methods. The fluorescence quenching of the C(60) moiety indicates that charge-separation takes place via the singlet excited state of the C(60) moiety in both polar and non-polar solvents. The charge-separated state, in which an electron is localized on the C(60) sphere and a hole is located on the whole donor moieties of ferrocene, pyrazole, and N,N-dimethylaniline groups, has been confirmed by nanosecond transient spectra in the visible and near-IR spectral region. The lifetimes of the radical ion-pairs are as long as 30 - 50 ns in both polar and non-polar solvents.
authors.affiliation: Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, 45071 Toledo, Spain.
authors.forename: Juan L
authors.initials: JL
authors.lastname: Delgado
authors.forename: Mohamed E
authors.initials: ME
authors.lastname: El-Khouly
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Araki
authors.forename: María J
authors.initials: MJ
authors.lastname: Gómez-Escalonilla
authors.forename: Pilar
authors.initials: P
authors.lastname: de la Cruz
authors.forename: Frédéric
authors.initials: F
authors.lastname: Oswald
authors.forename: Osamu
authors.initials: O
authors.lastname: Ito
authors.forename: Fernando
authors.initials: F
authors.lastname: Langa