Intrinsic chiral domains enantioselectively segregated from twisted nematic cells of bent-core mesogens.
Enantioselective segregation has been attained in the Bx phase of a novel substituted oxadiazole achiral banana-shaped liquid crystal (LC) without introducing any chiral species. This bent-core molecule exhibits LC polymorphism; the higher temperature nematic (N) phase and the lower temperature banana smectic phase (Bx phase), in which spontaneous chiral segregation with (+) and (-) chiral domains occurs with equal probabilities. In twisted cell geometries, extrinsically induced twisted N structures are formed and result in intrinsically chiral conglomerate when the temperature is decreased from N to Bx. The observed optical activity in homochiral Bx phase is comparable to those theoretically predicted and is proportional to the cell thickness.
Choi
Suk-Won
SW
Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Tokyo, Japan.
Kang
Sungmin
S
Takanishi
Yoichi
Y
Ishikawa
Ken
K
Watanabe
Junji
J
Takezoe
Hideo
H