Synthesis and characterisation of a novel chiral smectic liquid crystal compound

摘要

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.View full textDownload full textKeywordschiral smectic liquid crystal, ferroelectric, phase transitions, phase diagramRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/02678292.2012.686634