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Communication | Special issue | Vol 88, No. 2, 2014, pp.945-952
Published online, 16th August, 2013
DOI: 10.3987/COM-13-S(S)93
■ Chiral Memory Units Based on Dynamic Redox Systems with a Dibenzoxepinone Skeleton: Drastic Change in Racemization Barrier and Electrochemical Bistability

Kazuhisa Wada, Yuna Chiba, Takashi Takeda, Hidetoshi Kawai, Ryo Katoono, Kenshu Fujiwara, and Takanori Suzuki*

*Division of Chemistry, Graduate School of Science, Hokkaido University, Kita 10 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan

Abstract

The configuration of helical dicationic dyes 22+ with a dihydrodibenzoxepinone unit is stable, whereas the corresponding neutral electron donors 1 with a tetrahydrophenanthroxepinone skeleton easily undergo ring-flip. Thanks to their electrochemical bistability, electron exchange between 1 and 22+ is prohibited. Thus, the above electrochromic pairs 1/22+ can serve as new members of less well-explored redox-based chiral-memory units.