Relationships between mesophase behavior and crystal structures of chiral smectogenic 4-[(S)-2-methylbutyl]phenyl 4'-alkoxybiphenyl-4-carboxylates
Relationships between mesophase behavior and crystal structures of chiral smectogenic 4-[(S)-2-methylbutyl]phenyl 4'-alkoxybiphenyl-4-carboxylates
复制标题
手性致色4-[(S)-2-甲基丁基]苯基4-烷氧基联苯-4-羧酸酯的中间相行为与晶体结构之间的关系
DOI：
10.1246/bcsj.62.1751
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发表时间：
1989
影响因子：
4
通讯作者：
Y. Ohashi
中科院分区：
文献类型：
--
作者：
K. Hori;Miho Takamatsu;Y. Ohashi
通过X射线衍射测量标题系列的Sm*C和Sm A相的层间距离作为温度的函数。随着温度的升高，Sm*C 中的分子倾斜角从 22–25 减小到 0°。庚基 (1) 和辛基 (2) 同系物的晶体结构已通过 X 射线分析确定。 (1)：4'-庚氧基联苯-4-甲酸4-[(S)-2-甲基丁基]苯基酯，单斜晶系，P21，a=26.929(4)，b=5.4249(5)，c=9.2607(9)A，β=96.78(1)°，Z=2。 (2)：4-[(S)-2-甲基丁基]苯基4'-辛氧基联苯-4-羧酸酯，斜方晶系，P212121，a=9.249(1)，b=56.259(9)，c=5.412(1)A，Z=4。最终 R 分别为 0.076 和 0.121。两种晶体都具有与 Sm*C 相似的独特层结构。在前一种晶体中，分子在整个层中均匀地向一个方向倾斜，而在后一种晶体中，分子在层与层之间交替采用两个相反的方向。然而，层内的结构彼此非常相似。每个分子都有一个共面的联苯部分和一个扭曲的链烷结构...
Interlayer distances of Sm*C and Sm A phases of the title series were measured as functions of temperature by X-ray diffraction. With increase in temperature, molecular tilt angles in Sm*C decrease from 22–25 to 0°. Crystal structures of the heptyl (1) and octyl (2) homologues have been determined by X-ray analysis. (1): 4-[(S)-2-Methylbutyl]phenyl 4′-heptyloxybiphenyl-4-carboxylate, monoclinic, P21, a=26.929(4), b=5.4249(5), c=9.2607(9) A, β=96.78(1)°, Z=2. (2): 4-[(S)-2-Methylbutyl]phenyl 4′-octyloxybiphenyl-4-carboxylate, orthorhombic, P212121, a=9.249(1), b=56.259(9), c=5.412(1) A, Z=4. Final R were 0.076 and 0.121, respectively. Both crystals have distinct layer structures similar to those of Sm*C. In the former crystal, the molecules tilt to one direction uniformly throughout layers, while in the latter, they take two opposite directions alternately from layer to layer. However, structures within a layer are very similar to each other. Each molecule has a coplanar biphenyl moiety and a twisted paraf...