Pretransitional Layer Contraction at the Chiral Smectic A-to-Chiral Smectic C Phase Transition of a Chiral Nitroxide Radical
Pretransitional Layer Contraction at the Chiral Smectic A-to-Chiral Smectic C Phase Transition of a Chiral Nitroxide Radical
复制标题
手性氮氧自由基从手性近晶 A 到手性近晶 C 相变时的预转变层收缩
DOI：
10.1021/jp400325q
复制
发表时间：
2013
影响因子：
3.3
通讯作者：
H. Nohira
中科院分区：
文献类型：
--
作者：
Y. Uchida;K. Suzuki;R. Tamura;Y. Aoki;H. Nohira
我们设计并合成了一种新的手性顺磁液晶化合物，其含氮氧自由基，显示手性近晶A（SmA*）和C（SmC*）相。该化合物显示在冷却运行中的SmA*-SmC * 相变之前的pretransitional层收缩。电子顺磁共振光谱，X-射线衍射分析，和偏光显微镜显示，温度依赖性的构象变化是负责的前过渡层收缩。
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 that a temperature-dependent conformational change is responsible for the pretransitional layer contraction.