Reversible visible-light tuning of self-organized helical superstructures enabled by unprecedented light-driven axially chiral molecular switches.
Two enantiomeric light-driven azo molecular switches with axial chirality and extended conjugation were found to exhibit unprecedented reversible photoisomerization in both organic-solvent and liquid-crystal media only upon visible-light irradiation. When doped in an achiral liquid crystal with a different concentration, the chiral switch was able either to immediately induce an optically tunable helical superstructure or to retain an achiral liquid-crystal phase whose helical superstructure was induced and tuned reversibly upon visible-light irradiation. Furthermore, reversible dynamic red, green, and blue reflection achieved only by using visible light was demonstrated.
Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA.
Yan
Y
Wang
Augustine
A
Urbas
Quan
Q
Li