CRYSTAL-STRUCTURE OF A TETRACATENAR MESOGEN DERIVED FROM 3,4-DIALKOXYCINNAMIC ACID

被引:7
作者
ALLOUCHI, H
BIDEAU, JP
COTRAIT, M
DESTRADE, C
NGUYEN, HT
机构
[1] UNIV BORDEAUX 1,CRISTALLOG LAB,CNRS,URA 144,F-33405 TALENCE,FRANCE
[2] CTR RECH PAUL PASCAL,F-33405 TALENCE,FRANCE
来源
MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 1994年 / 239卷
关键词
MESOGENIC COMPOUND; TETRACATENAR MESOGEN; CRYSTAL STRUCTURE;
D O I
10.1080/10587259408047179
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
The crystal structure of a biforked mesogen, exhibiting nematic and smectic phases, derived from 3,4-dialkyloxyphenyl cinnamic acid has been determined by direct methods. The crystal belongs to the P-21/c space group (Z = 4): a = 42.380(7), b = 9.605(2), c = 18.12(1) Angstrom, beta = 97.93(2)degrees. Least squares refinement leads to R = 0.091. The molecules adopt a zig-zag form and the non-aliphatic central core is almost linear, and 35 Angstrom long. The four alkyloxy chains are stretched (ttt). The mean axis of the alkyloxy chains makes an angle close to 130 degrees with the central core. The molecules make sheets of abour 43 Angstrom thick and are arranged as in a smectic C mesophase. The polyaromatic central core makes an angle close to 70 degrees (tilt angle) with the normal to the sheet and is quasi-parallel to the (xz) plane. The interactions between the sheets are very weak. The structure is compared to those of similar compounds whose structure has recently been published.
引用
收藏
页码:153 / 164
页数:12
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