Molecular design for a cybotactic nematic phase
Molecular design for a cybotactic nematic phase
复制标题
细胞趋向列相的分子设计
DOI：
10.1039/c4tc00001c
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
J. Yamamoto and A.Yoshizawa
中科院分区：
文献类型：
--
作者：
W. Nishiya;Y. Takanishi;J. Yamamoto and A.Yoshizawa
环状向列相(NCyb)已经引起了人们的广泛关注。然而，几乎所有研究过它的分子都具有弯曲形状的结构。我们设计了一种U形化合物，以及一些末端带有羟基的棒状化合物。然后，我们用偏光显微镜、差示扫描量热法和X射线衍射仪研究了它们的相变行为。具有两个1，4-二苯基-2，3-二氟苯单元的U型化合物在20K温度范围内表现为Ncyb相和近晶C(SMC)相。随着温度的降低，这些相中的层间距不断减小。棒状化合物4-[4-(6-hydroxyhexyloxy)phenyl]-1-(4-hexyloxyphenyl)-2，3-difluorobenzene，在25K温度范围内出现NCyB相和SMC相。在Ncyb-SMC转变过程中，层间距呈现不连续的减小。本报告介绍了两种产生Ncyb相的方法，即(1)在U形化合物中引入侧向关联和(2)在棒形化合物中引入不同的末端基团。
The cybotactic nematic phase (Ncyb) has attracted much attention. However, almost all molecules in which it has been investigated have had a bent-shaped structure. We designed a U-shaped compound, and some rod-like compounds which possessed a terminal hydroxyl group. We then investigated their phase transition behaviour using polarized optical microscopy, differential scanning calorimetry, and X-ray diffraction. The U-shaped compound possessing two 1,4-diphenyl-2,3-difluorobenzene units was found to exhibit an Ncyb phase, with a temperature range of 20 K and a smectic C (SmC) phase. The layer spacing in these phases decreased continuously with decreasing temperature. The rod-like compound, 4-[4-(6-hydroxyhexyloxy)phenyl]-1-(4-hexyloxyphenyl)-2,3-difluorobenzene, was found to exhibit an Ncyb phase with a temperature range of 25 K and an SmC phase. The layer spacing showed a discontinuous decrease at the Ncyb–SmC transition. This report presents two approaches for producing an Ncyb phase, i.e., (1) the introduction of a lateral correlation in the U-shaped compounds and (2) the introduction of different terminal groups in the rod-shaped compounds.
登录
查看更多内容
液晶的 X 射线摄影研究：IV. 一些 4-烷氧基苯甲醛-4-乙基苯胺的各向同性、向列相和近晶 A 相
DOI：
--
发表时间：
1973
期刊：
影响因子：
--
作者：
A. D. Vries
通讯作者：
A. D. Vries
影响因子：
--
作者：
Shanker, Govindaswamy;Prehm, Marko;Tschierske, Carsten
通讯作者：
Tschierske, Carsten
影响因子：
3.4
作者：
A. Chakraborty;M. K. Das;B. Das;A. Lehmann;C. Tschierske
通讯作者：
C. Tschierske
具有两个正交近晶相和相邻向列相新序列的弯芯液晶中极性顺序的发展
影响因子：
--
作者：
G. Shanker;M. Prehm;M. Nagaraj;J. Vij;C. Tschierske
通讯作者：
C. Tschierske
影响因子：
3.4
作者：
Francescangeli, Oriano;Vita, Francesco;Samulski, Edward T.
通讯作者：
Samulski, Edward T.