Synthesis and mesomorphic properties of some esters of trans-4-n-alkoxycinnamic and trans-4-n-alkoxy-alpha-methylcinnamic acids exhibiting ferroelectric and antiferroelectric phases
作者:
N. KASTHURAIAH,
B. K. SADASHIVA,
S. KRISHNAPRASAD,
GEETHA G. NAIR,
期刊:
Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 24,
issue 5
页码: 639-645
ISSN:0267-8292
年代: 1998
DOI:10.1080/026782998206740
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The synthesis and mesomorphic properties of several homologues of (S)-(+)-1-methylheptyl 4-[4(trans-4-n-alkoxycinnamoyloxy)benzoyloxy]benzoates (series I) and (S)-(+)-1-methylheptyl 4-[4-(trans-4-n-alkoxy-alpha-methylcinnamoyloxy)benzoyloxy]benzoates (series II) are described. The influence of the alpha -methyl group on the different mesophases and the clearing temperatures has been evaluated. Many homologues of both the series show a ferroelectric chiral smectic C (SmC*) phase while the antiferroelectric smectic C phase (SmC*A) is exhibited by compounds of series I. The mesophases have been identified by optical polarizing microscopy, differential scanning calorimetry and miscibility studies. The spontaneous polarization, the helical pitch and the tilt angle of two of the compounds have also been measured.
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