Antiferroelectric Chiral Smectic C Materials Having a 2-Alkyl Alkanoyl Group in the Chiral Part
Antiferroelectric Chiral Smectic C Materials Having a 2-Alkyl Alkanoyl Group in the Chiral Part
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手性部分具有2-烷基烷酰基的反铁电手性近晶C材料
DOI：
10.1143/jjap.28.l2248
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发表时间：
1989
影响因子：
1.5
通讯作者：
T. Hirai
中科院分区：
文献类型：
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作者：
I. Nishiyama;A. Yoshizawa;Mitsuo Fukumasa;T. Hirai
介绍了新型反铁电手性近晶C（SmCA*）材料。研究了四种手性部分含有2-烷基烷酰基的同系化合物。其中三个具有SmCA*，并且在SmC* 中显示非常短的螺距。相反，另一个没有SmCA*，并且在SmC* 中表现出相当长的间距。这一结果表明，间距的长度与SmCA* 的出现密切相关。在手性碳中引入乙基而不是甲基增加了SmCA* 的稳定性，而SmA和SmC* 的稳定性降低。所有四个化合物显示的第三状态，即使在SmC* 的应用程序的AC领域。显微镜观察表明，SmC ~* 中的第三态不同于SmCA ~* 中的第三态。
Novel antiferroelectric chiral smectic C (SmCA*) materials are presented. Four homologous compounds having a 2-alkyl alkanoyl group in the chiral part are investigated. Three of them have SmCA* and show very short helical pitch in SmC*. In contrast, the other one has no SmCA* and exhibits rather long pitch in SmC*. This result suggests that the length of the pitch relates closely to occurrence of SmCA*. The introduction of an ethyl group into the chiral carbon instead of a methyl group increases the stability of SmCA* in contrast with decreasing that of SmA and SmC*. All four compounds show the third state even in SmC* by application of an AC field. Microscope observation indicates that the third state in SmC* is different from that in SmCA*.
Y. Ouchi、H. Takezoe 和 A. Fukuda：铁电体。
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