3A11 偏光赤外分光法によるV字型反転液晶セルにおける分子配向の評価

概要

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Molecular orientation in a chiral smectic phase showing V-shaped switching was discussed using a polarized FT- IR measurement. In a homogeneous cell of a three compounds mixture in which V-shaped switching was firstly observed, infrared absorption anisotropy of phenyl ring C-C stretching vibration was observed, which suggested the distribution of orientation of the molecular long axis of core part. In the smectic phase showing V-shaped switching. the absorbance attains its maxima (A_<max>) and minima (A_<min>) when polarization direction of incident radiation is parallel and perpendicular to the layer normal. The dichroic ratio (A_<max>/A_<min>) becomes higher than that in the antiferroelectric phase appearing the lower temperature side even in the zero field, this ratio was almost the same as that in the SmA phase. This results clearly indicates that the molecular orientation was ordered, but not random.
日本液晶学会の論文
1999-09-28