Crystal Structures of Chiral Mesogenic 4-[(S)-2-Methylbutyl]-phenyl and 4-[(S)-1-Methylheptyloxy]phenyl 4'-Octylbiphenyl-4-carboxylates
Crystal Structures of Chiral Mesogenic 4-[(S)-2-Methylbutyl]-phenyl and 4-[(S)-1-Methylheptyloxy]phenyl 4'-Octylbiphenyl-4-carboxylates
复制标题
手性介晶4-[(S)-2-甲基丁基]-苯基和4-[(S)-1-甲基庚氧基]苯基4-辛基联苯-4-羧酸酯的晶体结构
DOI：
10.1246/bcsj.68.3347
复制
发表时间：
1995
影响因子：
4
通讯作者：
K. Hori
中科院分区：
文献类型：
--
作者：
Kyoko Ito;K. Hori
对不同手性基团的标题化合物进行了单晶X-射线衍射分析，得到不同的相序列：晶体（crystal.）近晶G（SG）-SJ*-SF*-SI*-SC*-SA-胆固醇-各向同性对于2-甲基丁基化合物（1）和晶体- SB-SA-iso。对于1-甲基庚氧基化合物（2）。每个晶体都具有近晶状层结构，其中分子倾斜角在1中为25°，在2中为15°。联苯部分几乎是共面的，正常链在两种晶体中具有全反式构象。然而，2的手性基团的长链具有扭曲的构象，并且排列在层之间。从极性基团的共轭和联苯部分的重叠两个方面讨论了晶体结构与中间相行为之间的关系。
Single crystal X-ray analysis has been carried out for the title compounds with different chiral groups, which result in different phase sequences: crystal (cryst.)-smectic G(SG)-SJ*-SF*-SI*-SC*-SA-cholesteric (chol.)-isotropic (iso.) for the 2-methylbutyl compound (1) and cryst.-SB-SA-iso. for the 1-methylheptyloxy compound (2). Each crystal has a smectic-like layer structure, in which the molecular tilt angle is 25° in 1 and 15° in 2. Biphenyl moieties are almost coplanar and normal chains have all-trans conformations in both crystals. However, long chains of the chiral groups of 2 have twisted conformations and are arranged between layers. Relationships between the crystal structures and the mesophase behavior are discussed in terms of conjugation of the polar groups and overlapping of biphenyl moieties for the related compounds.