화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals, Vol.465, 153-153, 2007
Chirality induced by circularly polarized light in liquid crystalline twin dimers with azo linkages
Emergence of large circular dichroism (CD) was found in liquid crystal twin dimers with azo linkages, nOAZmAZOn. The compounds with even m are of rod-shape and show the SmA phase, whereas those with odd m are of bent-shape and show the SmCA and B-x phases. Right- and left-circular polarized light (CPL) irradiation in the crystal and B-x phases induces positive and negative CD, respectively. However, large CD with the opposite sign is induced by decreasing temperature from SmCA to B-x under CPL irradiation. Two different mechanisms were discussed.