Laterally connected bent-core dimers and bent-core-rod couples with nematic liquid crystalline phases
Laterally connected bent-core dimers and bent-core-rod couples with nematic liquid crystalline phases
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DOI：
10.1039/c1jm13649f
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Tschierske, Carsten
中科院分区：
文献类型：
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作者：
Shanker, Govindaswamy;Prehm, Marko;Tschierske, Carsten
首次报道了横向连接的双核二液晶基元和涉及双核单元和棒状单元的液晶二液晶基元的实例。合成了四种不同类型的二介晶，并通过偏光显微镜（PM），差示扫描量热法（DSC）和X射线衍射（XRD）研究。其中两种联合收割机以侧-侧或侧-端拓扑结构将两种衍生自4-氰基间苯二酚的双核介晶结合，另外两种联合收割机以侧-侧或侧-端方式将基于4-氰基间苯二酚的双核介晶与棒状介晶结合。所有的化合物，除了一个，表现出SmC型cybotactic集群（N-cybC）组成的结晶相，具有较宽的相范围和较低的结晶温度。两个化合物显示额外的低温相，SmC相和矩形柱状相观察。
First examples of laterally connected bent-core dimesogens and liquid crystalline dimesogens involving bent-core units and rod-like units are reported. Four distinct types of dimesogens have been synthesized and investigated by polarizing microscopy (PM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD) studies. Two of them combine two bent-core mesogens derived from 4-cyanoresorcinol either in a lateral-lateral or lateral-terminal topology, the other two types combine a 4-cyanoresorcinol based bent-core mesogen with a rod-like mesogen in a lateral-lateral or lateral-terminal manner. All compounds, except one, exhibit nematic phases composed of SmC-type cybotactic clusters (N-cybC) with wide phase ranges and low crystallization temperatures. Two compounds show additional low temperature phases, an SmC phase and a rectangular columnar phase were observed.