title: Determination of the structural features of a long-lived electron-transfer state of 9-mesityl-10-methylacridinium ion.
abstract: Extensive efforts have been devoted to developing electron donor-acceptor systems that mimic the utilization of solar energy that occurs in photosynthesis. X-ray crystallographic analysis shows how absorbed photon energy is stabilized in those compounds by structural changes upon photoinduced electron transfer (ET). In this study, structural changes of a simple electron donor-acceptor dyad, 9-mesityl-10-methylacridinium cation (Acr(+)-Mes), upon photoinduced ET were directly observed by laser pump and X-ray probe crystallographic analysis. The N-methyl group in Acr(+) was bent, and a weak electrostatic interaction between Mes and a counteranion in the crystal (ClO(4)) was generated by photoinduced ET. These structural changes correspond to reduction and oxidation due to photoinduced ET and directly elucidate the mechanism in Acr(+)-Mes for mimicking photosynthesis efficiently.
authors.affiliation: Department of Chemistry and Materials Science, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan. mhoshino@chem.titech.ac.jp
authors.forename: Manabu
authors.initials: M
authors.lastname: Hoshino
authors.forename: Hidehiro
authors.initials: H
authors.lastname: Uekusa
authors.forename: Ayana
authors.initials: A
authors.lastname: Tomita
authors.forename: Shin-ya
authors.initials: SY
authors.lastname: Koshihara
authors.forename: Tokushi
authors.initials: T
authors.lastname: Sato
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Nozawa
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Adachi
authors.forename: Kei
authors.initials: K
authors.lastname: Ohkubo
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Kotani
authors.forename: Shunichi
authors.initials: S
authors.lastname: Fukuzumi
mesh_terms: D000166:Acridines / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004579:Electron Transport; D008958:Models, Molecular; D015394:Molecular Structure
chemical_list: C484398:9-mesityl-10-methylacridinium; D000166:Acridines