title: Modulation of Energy Conversion Processes in Carbonaceous Molecular Bearings.
abstract: The energetics and photodynamics of carbonaceous molecular bearings with discrete molecular structures were investigated. A series of supramolecular bearings comprising belt-persistent tubular cycloarylene and fullerene molecules accepted photonic stimuli to afford charge-separated species via a photoinduced electron transfer process. The energy conversion processes associated with the photoexcitation, however, differed depending on the molecular structure. A π-lengthened tubular molecule allowed for the emergence of an intermediary triplet excited state at the bearing, which should lead to an energy conversion to thermal energy. On the other hand, low-lying charge-separated species induced by an endohedral lithium ion in fullerene enabled back electron transfer processes to occur without involving triplet excited species. The structure-photodynamics relationship was analyzed in terms of the Marcus theory to reveal a large electronic coupling in this dynamic supramolecular system.
authors.affiliation: Department of Chemistry, Tohoku University, Aoba-ku, Sendai, 980-8578, Japan.
authors.forename: Shunpei
authors.initials: S
authors.lastname: Hitosugi
authors.affiliation: Department of Material and Life Science, Graduate School of Engineering, Osaka University, ALCA and SENTAN, JST, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan.|Department of Chemistry and Nano Science, Ewha Womans University, Seoul, 120-750, Korea.
authors.forename: Kei
authors.initials: K
authors.lastname: Ohkubo
authors.affiliation: Department of Material and Life Science, Graduate School of Engineering, Osaka University, ALCA and SENTAN, JST, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Kawashima
authors.affiliation: Advanced Institute for Materials Research (AIMR) and, JST, ERATO, Isobe Degenerate π-Integration Project, Tohoku University, Aoba-ku, Sendai, 980-8577, Japan.
authors.forename: Taisuke
authors.initials: T
authors.lastname: Matsuno
authors.affiliation: Department of Chemistry, Tohoku University, Aoba-ku, Sendai, 980-8578, Japan.
authors.forename: Sho
authors.initials: S
authors.lastname: Kamata
authors.affiliation: Department of Chemistry, Tohoku University, Aoba-ku, Sendai, 980-8578, Japan.
authors.forename: Kosuke
authors.initials: K
authors.lastname: Nakamura
authors.affiliation: Department of Chemistry, Tohoku University, Aoba-ku, Sendai, 980-8578, Japan.
authors.forename: Hirohiko
authors.initials: H
authors.lastname: Kono
authors.affiliation: Department of Chemistry, Tohoku University, Aoba-ku, Sendai, 980-8578, Japan.|Advanced Institute for Materials Research (AIMR) and, JST, ERATO, Isobe Degenerate π-Integration Project, Tohoku University, Aoba-ku, Sendai, 980-8577, Japan.
authors.forename: Sota
authors.initials: S
authors.lastname: Sato
authors.affiliation: Department of Material and Life Science, Graduate School of Engineering, Osaka University, ALCA and SENTAN, JST, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan. fukuzumi@chem.eng.osaka-u.ac.jp.|Faculty of Science and Technology, Meijo University, ALCA and SENTAN, JST, Shiogamaguchi, Tempaku, Nagoya, Aichi, 468-8502, Japan. fukuzumi@chem.eng.osaka-u.ac.jp.|Department of Chemistry and Nano Science, Ewha Womans University, Seoul, 120-750, Korea. fukuzumi@chem.eng.osaka-u.ac.jp.
authors.forename: Shunichi
authors.initials: S
authors.lastname: Fukuzumi
authors.affiliation: Department of Chemistry, Tohoku University, Aoba-ku, Sendai, 980-8578, Japan. isobe@m.tohoku.ac.jp.|Advanced Institute for Materials Research (AIMR) and, JST, ERATO, Isobe Degenerate π-Integration Project, Tohoku University, Aoba-ku, Sendai, 980-8577, Japan. isobe@m.tohoku.ac.jp.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Isobe
keywords: electron transfer; fullerenes; molecular bearings; nanotubes; peapods