Crystal structures of chiral smectogenic 4′-octylbiphenyl-4-yl p-[(S)-1-methylheptyloxy]benzoate and p-octylphenyl 4′-[(S)-1-methylheptyloxy]biphenyl-4-carboxylate
Crystal structures of chiral smectogenic 4′-octylbiphenyl-4-yl p-[(S)-1-methylheptyloxy]benzoate and p-octylphenyl 4′-[(S)-1-methylheptyloxy]biphenyl-4-carboxylate
复制标题
手性成色4′-辛基联苯-4-基对-[(S)-1-甲基庚氧基]苯甲酸酯和对辛基苯基4′-[(S)-1-甲基庚氧基]联苯-4-羧酸酯的晶体结构
DOI：
10.1039/jm9910100667
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发表时间：
1991
影响因子：
--
通讯作者：
Y. Ohashi
中科院分区：
文献类型：
--
作者：
K. Hori;Y. Ohashi
本文报道了对-[（S）-1-甲基庚氧基]苯甲酸-4 ′-辛基联苯-4-基酯（1）的单晶X-射线衍射分析，其相序为：-s stecC-chol.-iso.，4′-[（S）-1-甲基庚氧基]联苯-4-羧酸对辛基苯基酯（2），其相序为-s stecC-sA-chol.-iso。每个晶体都具有近晶状层结构，其中1中的分子倾斜角大（65°），而2中的分子倾斜角小（10°）。这些被解释为由分子几何形状（即被极性基团夹在中间的部分的长度）导致的特征与液晶相的结构密切相关。
Single-crystal X-ray analyses have been carried out for 4′-octylbiphenyl-4-yl p-[(S)-1-methylheptyloxy]benzoate (1), which has a phase sequence of cryst.–s˙C–chol.–iso., and p-octylphenyl 4′-[(S)-1-methylheptyloxy]biphenyl-4-carboxylate (2), which has a phase sequence of cryst.–s˙C–sA–chol.–iso. Each crystal has a smectic-like layer structure, in which the molecular tilt angle is large (65°) in 1, whereas it is small (10°) in 2. These features, which are interpreted to result from the molecular geometry, i.e. the length of the moiety sandwiched by polar groups, are closely related to the structures of the liquid-crystalline phases.