We have designed and synthesized a new chiral paramagnetic liquid crystalline compound with a nitroxide radical moiety showing chiral smectic A (SmA*) and C (SmC*) phases. This compound shows pretransitional layer contraction prior to the SmA*-to-SmC* phase transition in the cooling run. Electron paramagnetic resonance spectroscopy, X-ray diffraction analysis, and polarized optical microscopy reveal
我们设计并合成了一种新的手性顺磁性液晶化合物,该化合物具有
一氧化氮自由基部分,显示出手性近晶A(SmA *)和C(SmC *)相。该化合物在冷却过程中在SmA *到SmC *相变之前显示出过渡前层收缩。电子顺磁共振光谱,X射线衍射分析和偏振光学显微镜揭示,温度依赖性的构象变化是过渡前层收缩的原因。