title: Design of fullerene derivatives for stabilizing LUMO energy using donor groups placed in spatial proximity to the C60 cage.
abstract: A series of arylated dihydrofullerene derivatives were synthesized to elucidate the effective design of fullerene derivatives for enhancing the performance of organic photovoltaics. The LUMO energy of the fullerenes was estimated by the first reduction potential and theoretical calculations. The results showed that the methoxy groups substituted at spatial proximity to the fullerene core offered significant stabilization of the LUMO level. The stabilizing effect of the directly arylated fullerenes is more significant than that of conventional methanofullerenes. The theoretical investigation was performed with regard to the electronic interaction between the methoxy and fullerene moieties.
authors.affiliation: Osaka Municipal Technical Research Institute, 1-6-50 Morinomiya, Joto-ku, Osaka 536-8553, Japan. matumoto@omtri.or.jp
authors.forename: Fukashi
authors.initials: F
authors.lastname: Matsumoto
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Iwai
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Moriwaki
authors.forename: Yuko
authors.initials: Y
authors.lastname: Takao
authors.forename: Takatoshi
authors.initials: T
authors.lastname: Ito
authors.forename: Takumi
authors.initials: T
authors.lastname: Mizuno
authors.forename: Toshinobu
authors.initials: T
authors.lastname: Ohno