2A12 ラセミ化合物のスメクティック相における自発的光学分割

概要

論文の詳細を見る
Just 150 years ago, Pasteur found by optical microscopy that crystals of a sodium ammonium salt of "acide racemique" were spontaneously resolved into two enantiomorphos forms. In spite of extensive effort, no one has succeeded in observing the same phenomenon in a fluid state because of the thermal fluctuation and diffusion. We report spontaneous chiral optical resolution in a fluid system of a racemic diastereomer, (R,S)-β-Me-TFMHPOBC. In a homogeneous cell, the smectic liquid crystal of the racemate of diastereomeric molecules was found to exhibit an electrooptic response and a bistable domain switching in the SmC-like phase, although no macroscopic dipole is expected to exist. Moreover, the homeotropic cells of this material exhibit striped domains. The striped domains are associated with fine stripes having two opposite tilt senses with respect to the predominant stripes, indicating the co-existence of right- and left- handed homo-chiral domains.
日本液晶学会の論文
1999-09-28