Smectic mesophases from dihydroxy derivatives of quaternary alkylammonium salts

被引:4
|
作者
Arkas, M
Tsiourvas, D
Paleos, CM
Skoulios, A
机构
[1] Inst Phys & Chim Mat Strasbourg, Grp Mat Organ, F-67037 Strasbourg, France
[2] NCSR Demokritos, Inst Phys Chem, GR-15310 Athens, Greece
关键词
amphiphiles; liquid crystals; quaternary ammonium salts; structure elucidation; thermotropism;
D O I
10.1002/(SICI)1521-3765(19991105)5:11<3202::AID-CHEM3202>3.0.CO;2-N
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A series of N,N-di(2-hydroxyethyl)-N-methyl-N-alkylammonium bromides (alkyl chain from dodecyl to octadecyl) was synthesized and characterized. Its thermotropic liquid-crystal behaviour was studied by differential scanning calorimetry, polarizing optical microscopy, infrared spectroscopy and X-ray diffraction. Two smectic phases were identified, an ordered smectic T and a disordered smectic A phase. Both phases result from an alternate periodic stacking of polar sublayers of ionic head groups and apolar sublayers of alkyl chains in a disordered conformation. In the low-temperature smectic T phase, the ionic head groups are arranged inside the polar sublayers in a particularly dense fashion, a tetragonal crystal lattice. In the high-temperature smectic A phase, the ionic head groups are arranged in a disordered fashion with normal packing density.
引用
收藏
页码:3202 / 3207
页数:6
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