PA10 電子スピン共鳴による常磁性キラル有機ラジカル液晶の分子配向に関する研究(トピカルセッション-液晶物性計測の最前線-, 2005年日本液晶学会討論会)

概要

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By electron paramagnetic resonance (EPR) spectroscopy we studied the molecular orientation of the recently synthesized chiral paramagnetic liquid crystal (LC) 1, which contains a spin source within the rigid core. EPR measurement of the respective nematic or chiral nematic phase of the racemic or enantiomerically enriched 1 in a transversally and longitudinally rubbing cells (4μm thickness) gave the rotation angle profiles of g-value around two axes. By considering the MM2 optimized molecular structure in that the molecular long axis is orthogonal to the NO bond axis but not to the C-N-C plane, the angle profiles are successfully simulated by the models that the LC molecule can freely rotate around the molecular long axis in both cases ; this long axis is always parallel to the rubbing direction in the nematic phase and orthogonal to the helical axis of the chiral nematic phase.
日本液晶学会の論文
2005-09-05