Complementary Helicity Interchange of Optically Switchable Supramolecular-Enantiomeric Helicenes with (-)-Gel-Sol-(+)-Gel Transition Ternary Logic

A gallamide-containing pseudoenantiomeric helicene pair bearing a (10R,11R)-dimethoxymethyl-dibenzosuberane core can self-assemble by intermolecular amide H-bonding and pi-pi stacking into bundled helical fibers with helical tunnels of complementary helicity in CH2Cl2. The helicenes undergo excellent complementary photoswitchings of ternary logic at 280, 318, and 343 nm through (-)-gel-sol-(+)-gel interconversion.