Novel liquid crystals based on [1]benzothieno[3,2-b ][1]benzothiophene
Novel liquid crystals based on [1]benzothieno[3,2-b ][1]benzothiophene
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DOI：
10.1080/0267829031000097484
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发表时间：
2003-05-01
期刊：
影响因子：
2.2
通讯作者：
Glogarová, M
中科院分区：
文献类型：
--
作者：
Kosata, B;Kozmik, V;Glogarová, M
合成了四个系列的新型[1]苯并噻吩并[3，2- B ][1]苯并噻吩衍生物。在非手性系列的SmA相发生，而手性系列表现出一个相当宽的反铁电SmCA* 相下面的SmA相。用DSC和介电谱研究了SmA-SmCA* 的相变。在SmCA* 阶段的自发量已被测量。倾斜角显示出典型的温度依赖性和自发极化的值是相当温和的。螺距的长度随着非手性烷基链的长度增加而增加。
Four series of new [1]benzothieno[3,2- b ][1]benzothiophene derivatives have been synthesized. In the non-chiral series a SmA phase occurs, while the chiral series exhibits a rather wide antiferroelectric SmCA* phase just below the SmA phase. The SmA-SmCA* phase transition has been studied using DSC and dielectric spectroscopy. In the SmCA* phase the spontaneous quantities have been measured. The tilt angle shows a typical temperature dependence and the values of spontaneous polarization are rather moderate. The length of the helical pitch increases on increasing the length of the non-chiral alkyl chain.