CHIRAL MEMORY UNITS BASED ON DYNAMIC REDOX SYSTEMS WITH A DIBENZOXEPINONE SKELETON: DRASTIC CHANGE IN RACEMIZATION BARRIER AND ELECTROCHEMICAL BISTABILITY

摘要

The configuration of helical dicationic dyes 2~(2+) 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 2~(2+) is prohibited. Thus, the above electrochromic pairs l/2~(2+) can serve as new members of less well-explored redox-based chiral-memory units.