Abstract
(Figure Presented) An unprecedented dual-mode optical switch by combining helicene and bis-azobenzene moieties in proximity allows for cooperative, highly diastereoselective chlrochromic (92/8 to 3/97) and photochromic (>99/<1 to 19/81) switchings both in solution and In nematic LC with tunable pitches and handedness by permutation of four different metastable states. © 2010 American Chemical Society.