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Mesomorphic and fluorescence properties of methyl 4-(4-alkoxystyryl)benzoates
Authors:Khushi Muhammad  Saba Nazir  Ivan H Bechtold
Institution:1. Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan;2. Departmento de Fisica, Universidade Federal de Santa Catarina – UFSC, 88040-900 Florianopolis, SC, Brazil
Abstract:A series of methyl 4-(4-alkoxystyryl)benzoates was synthesised and studied for liquid crystalline and fluorescence properties. The peculiarity of the reaction scheme involved condensation between 4-alkoxybenzaldehyde and 4-(methoxycarbonyl)benzyltriphenyl phosphonium bromide in dichloromethane without any phase separation. The compounds were found thermally stable up to 200°C. The banded or arced focal-conic fan texture of CrE phase was exhibited on cooling the compounds (with chain length > C4) below the SmA phase. It was observed that increasing chain length up to C10 enhances mesophase stability. No LC behaviour was manifested by small (up to C3) and branched small chain (up to C4) members of the series.
Keywords:styryl esters  banded focal-conic  Smectic E phase  fluorescent LC
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