Pretransitional Layer Contraction at the Chiral Smectic A-to-Chiral Smectic C Phase Transition of a Chiral Nitroxide Radical

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• 作者：Yoshiaki Uchida ; Katsuaki Suzuki ; Rui Tamura ; Yoshio Aoki ; Hiroyuki Nohira
• 刊名：The Journal of Physical Chemistry B
• 出版年：2013
• 出版时间：March 14, 2013
• 年：2013
• 卷：117
• 期：10
• 页码：3054-3060
• 全文大小：391K
• 年卷期：v.117,no.10(March 14, 2013)
• ISSN：1520-5207

文摘

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.