title: Hydrogen-bonding dynamics in photoinduced electron transfer in a ferrocene-quinone linked dyad with a rigid amide spacer.
abstract: A newly designed ferrocene-quinone dyad with an amide space (Fc-Q) is employed to examine formation of the hydrogen bonding in the one-electron reduced form (Q*-) and the dynamics in the photoinduced electron-transfer reaction from the ferrocene to the quinone moiety. Photoexcitation of the Q moiety in Fc-Q in deaerated PhCN with 388 nm results in intramolecular electron transfer from Fc to the singlet excited state of Q to produce Fc+-Q*- without changing the conformation (<1 ps), followed by hydrogen bond formation with the amide proton of the spacer (tau = approximately 5 ps). The resulting radical ion pair decays via a back electron transfer to the ground state at a longer time scale with a rate constant of 2.6 x 108 s-1.
authors.affiliation: Department of Material and Life Science, Graduate School of Engineering, Osaka University, CREST, Japan Science and Technology Corporation (JST), 2-1, Yamada-oka, Suita, Osaka 565-0871, Japan. fukuzumi@ap.chem.eng.osaka-u.ac.jp
authors.forename: Shunichi
authors.initials: S
authors.lastname: Fukuzumi
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Yoshida
authors.forename: Ken
authors.initials: K
authors.lastname: Okamoto
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Imahori
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Araki
authors.forename: Osamu
authors.initials: O
authors.lastname: Ito
mesh_terms: D000577:Amides / Q000737:chemistry; D016227:Benzoquinones / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry*; D006860:Hydrogen Bonding; D000075163:Metallocenes; D015394:Molecular Structure; D010777:Photochemistry
chemical_list: D000577:Amides; D016227:Benzoquinones; D005296:Ferrous Compounds; D000075163:Metallocenes; C004532:quinone; C004998:ferrocene