title: Drastic change in racemization barrier upon redox reactions: novel chiral-memory units based on dynamic redox systems.
abstract: The helical configuration of dication dyes 2(2+) with a dihydrodibenzoxepin unit remained unchanged even at high temperature, whereas the corresponding neutral electron donors 1 with a tetrahydrophenanthroxepin skeleton easily underwent racemization. Due to their electrochemical bistability, electron exchange between 1 and 2(2+) is prohibited. Thus, the above electrochromic pairs can serve as novel chiral-memory units where redox reactions trigger switching between an "erasable/writable"-state (1) and a "memorizing"-state (2(2+)).
authors.affiliation: Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan. tak@sci.hokudai.ac.jp
authors.forename: Takanori
authors.initials: T
authors.lastname: Suzuki
authors.forename: Kazuhisa
authors.initials: K
authors.lastname: Wada
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Ishigaki
authors.forename: Yasuyo
authors.initials: Y
authors.lastname: Yoshimoto
authors.forename: Eisuke
authors.initials: E
authors.lastname: Ohta
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Kawai
authors.forename: Kenshu
authors.initials: K
authors.lastname: Fujiwara
mesh_terms: D003990:Dibenzoxepins / Q000737:chemistry*; D004583:Electrons; D008958:Models, Molecular; D010084:Oxidation-Reduction
chemical_list: D003990:Dibenzoxepins