PHASMID AND BIFORKED MESOGENS WITH THIOBENZOATE END-GROUPS

被引:14
作者
NGUYEN, HT
DESTRADE, C
ALLOUCHI, H
BIDEAU, JP
COTRAIT, M
GUILLON, D
WEBER, P
MALTHETE, J
机构
[1] UNIV BORDEAUX 1,CNRS,URA144,CRYSTALLOG LAB,F-33405 TALENCE,FRANCE
[2] IPCMS,MAT ORGAN GRP,F-67083 STRASBOURG,FRANCE
[3] LAB PHYS SOLIDES,F-91405 ORSAY,FRANCE
关键词
D O I
10.1080/02678299308036465
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
One phasmid and fourteen biforked mesogens with thiobenzoate end groups have been synthesized and studied. The phasmid displays a hexagonal columnar phase with a lattice parameter a = 45.5 angstrom at 70-degrees-C. This phase is not observed for the biforked mesogens which exhibit only a nematic phase, a smectic C phase for short chains and an unknown phase for long chains. The tilt angle of the molecules in the smectic C phase is about 50-degrees (the layer thickness is 38.2 angstrom for a molecular length l = 61 angstrom in the case of IA (n = 12). The crystal structure of compound IB (n = 12) is monoclinic and the molecules adopt a zigzag form.
引用
收藏
页码:435 / 449
页数:15
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