Synthesis and mesomorphic properties of chiral liquid crystal dimers containing lactate units

详细信息    查看全文

• 作者：S. Senthil ; D. Srividhya ; S. Manjunathan ; S. Thirumaran ; S.-L. Wu
• 关键词：Ferroelectric liquid crystals ; Mesomorphism ; Electro optical properties ; Liquid crystal dimmers ; Chiral lactates
• 刊名：Journal of Molecular Structure
• 出版年：2008
• 出版时间：17 April 2008
• 年：2008
• 卷：877
• 期：1-3
• 页码：50-55
• 全文大小：564 K

文摘

A series of symmetrical chiral ferroelectric liquid crystal dimers viz., alkyl bis{(R)-2-[4-(4′-decyloxyphenyl)benzoyloxyphenoxy]propionates}, ABDBP-n (n = 6–10), containing lactate units were synthesized and characterized. The length of the methylene spacer was increased from 6 to 10 in between the two chiral carbons located at the inner side of dimer. All the synthesized dimers exhibited polymorphism by showing N^*, SmA^*, SmC^* and SmX^* (unidentified) mesophase sequence. The mesophases and their corresponding transition temperatures were identified by polarized microscopy and differential scanning calorimetric measurements. Electro-optic switching studies of these dimers in SmC^* phase has exhibited ferroelectric bistable switching characteristics with the maximum spontaneous polarization of about 60.74 nC cm⁻². The tilt angles of the SmC^* phase was also measured to confirm the tilted phase characteristics.