Flexible taper-shaped liquid crystal trimer exhibiting a modulated smectic phase

Flexible taper-shaped liquid crystal trimer exhibiting a modulated smectic phase
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具有调制近晶相的柔性锥形液晶三聚体

DOI:
10.1080/02678292.2014.950353
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发表时间:
2014
期刊:
Liquid Crystal
影响因子:
--
通讯作者:
and A. Yoshizawa
and A. Yoshizawa
中科院分区:
--
文献类型:
--
作者:
S. Kashima;Y. Takanishi;J. Yamamoto;and A. Yoshizawa

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我们制备了一些锥形液晶三聚体,其中两个苯基嘧啶单元和一个1,4-二苯基-2,3-二氟苯单元通过柔性间隔基与2,4-二羟基苯甲酸连接。然后,我们使用偏光光学显微镜、差示扫描显微镜和 X 射线衍射研究了它们的液晶特性。 6-[4–(5-辛基嘧啶-2-基)苯氧基]己基2-{7-{4-[4–(4-己基苯基)-2,3-二氟苯基]苯氧基}庚酰氧基}-4-{6-[4–(5-辛基嘧啶-2-基)苯氧基]己氧基}苯甲酸酯(1)被发现表现出各向同性液体-向列相的相序– 插层近晶 A – 插层背斜近晶 C – 调制近晶 C。 锥形三聚体的结构-性质关系表明,调制相是由偶极-偶极相互作用稳定的插层结构与通过堆积熵效应稳定的单层结构之间的竞争引起的。分子间相互作用引起的compound1构象变化在相变行为中起着重要作用。
We prepared some taper-shaped liquid-crystalline trimers in which two phenylpyrimidine units and a 1,4-diphenyl-2,3-difluorobenzene unit are connected to 2,4-dihdroxy benzoic acid via flexible spacers. We then investigated their liquid-crystalline properties using polarised optical microscopy, differential scanning microscopy and X-ray diffraction. 6-[4–(5-Octylpyrimidin-2-yl)phenyloxy]hexyl 2-{7-{4-[4–(4-hexylphenyl)-2,3-difluorophenyl]phenyloxy}heptanoyloxy}-4-{6-[4–(5-octylpyrimidin-2-yl)phenyloxy]hexyloxy}benzoate (1) was found to exhibit a phase sequence of isotropic liquid – nematic – intercalated smectic A – intercalated anticlinic smectic C – modulated smectic C. The structure–property relation in the taper-shaped trimers reveals that the modulated phase is induced by competition between an intercalated structure stabilised by dipole–dipole interaction and a monolayer structure by packing entropy effects. Conformational change of compound1induced by intermolecular interactions plays an important role in the phase transition behaviour.
关于两种不同类型的近晶 C 到近晶 A 转变的实验证据
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