作者:Akihisa Yamaguchi、Isa Nishiyama、Jun Yamamoto、Hiroshi Yokoyama、Atsushi Yoshizawa
DOI:10.1039/b406716a
日期:——
A homologous series of novel λ-shaped mesogenic compounds in which three mesogenic groups are connected to 3, 4-dihydroxybenzoic acid has been prepared and their physical properties investigated by means of optical microscopy, differential scanning calorimetry and X-ray diffraction measurements. The λ-shaped compounds studied showed unusual smectic phases. 4-Cyanobiphenyl-4â²-yl 3,4-bis6-[4-(5-octylpyrimidin-2-yl)phenyloxy]hexyloxy}benzoate was found to realize an incommensurate SmA (SmAinc) phase. A âuniform planarlyâ aligned sample of 2-(4-octylphenyl)pyrimidin-5-yl 3,4-bis6-[4-(5-octylpyrimidin-2-yl)phenyloxy]hexyloxy} benzoate showed a Schlieren-like texture in the smectic phase. We discuss structural effects of the λ-shaped compounds on molecular organization in liquid-crystalline phases.
已经制备了一组新型的λ形介晶化合物,其中三个介晶基团连接到3,4-二羟基苯甲酸,并通过光学显微镜、差示扫描量热法和X射线衍射测量研究了它们的物理性质。所研究的λ形化合物显示出异常的向列相。发现4-氰基联苯-4'-基-3,4-双6-[4-(5-辛基嘧啶-2-基)苯氧基]己氧基}苯甲酸酯实现了非公度SmA(SmAinc)相。2-(4-辛基苯基)嘧啶-5-基-3,4-双6-[4-(5-辛基嘧啶-2-基)苯氧基]己氧基}苯甲酸酯的“均匀平面”排列样品在向列相中显示出类似条纹的纹理。我们讨论了λ形化合物对液晶相中分子组织结构的结构效应。