Synthesis and characterisation of a novel chiral smectic liquid crystal compound

Autor:	H.T. Nguyen, S. Essid, Z. Rihab
Rok vydání:	2012
Předmět:	Phase transition Materials science business.industry General Chemistry Dielectric Condensed Matter Physics Ring (chemistry) Ferroelectricity Crystallography Differential scanning calorimetry Optics Liquid crystal Alkoxy group General Materials Science business Phase diagram
Zdroj:	Liquid Crystals. 39:865-872
ISSN:	1366-5855 0267-8292
DOI:	10.1080/02678292.2012.686634
Popis:	A new chiral smectic liquid crystal, (R)-1-methylheptyl-4-[4-(4-heptyloxythiobenzoyloxy)benzoyloxy]-2-fluoroben-zoate, denoted as C7F2(COS), which has a thiobenzoate group between the two phenyl rings near the alkoxy chain and is monofluoro-substituted in position 2 of the first phenyl ring near the chiral chain, has been synthesised. Its mesomorphic and ferroelectric properties have been investigated by optical microscopy, differential scanning calorimetry, the electro-optical method and dielectric measurements. The spontaneous polarisation, tilt angle, response time, orientational viscosity, relaxation frequency and dielectric strength have been determined as a function of temperature. The electric-field temperature phase diagram was established and all the results have been compared with those of the C7F2 compound studied previously.
Databáze:	OpenAIRE
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