Ferroelectric liquid crystals derived from isoleucine I. Synthesis and characterization
作者:
THEO J. DINGEMANS,
CHI-DUEN POON,
EDWARD T. SAMULSKI,
HIROYUKI UEHARA,
JUN HATANO,
期刊:
Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 24,
issue 2
页码: 247-253
ISSN:0267-8292
年代: 1998
DOI:10.1080/026782998207424
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A series of ferroelectric liquid crystals (FLCs), 4 (3-methyl-2-halopentanoyloxy)- 4-hexyloxybiphenyls (3M2XPHOB, X=F for fluorine, C for chlorine, B for bromine) and their racemates (3M2XPHOB-R), were synthesized and characterized. The FLCs contain a chiral tail comprised of alpha -halo acids which are derived from L-isoleucine (DL-isoleucine for the racemates). The mesogens were characterized by high-resolution 1H and 13C NMR and their phase behaviour was studied by optical microscopy and differential scanning calorimetry. The chloro and bromo derivatives show both chiral smectic C (SmC*) phases and smectic A (SmA) phases, while the fluoro derivatives exhibit only a SmA phase. The spontaneous polarization of 3M2CPHOB and 3M2BPHOB were measured in the respective SmC* phases; that of the fluoro derivative was inferred by extrapolating its concentration dependent polarization in an achiral SmC solvent, a racemic mixture of 3M2BPHOB.
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