Synthesis and frustrated phases of chiral liquid crystals derived from (R)-3-alkoxy-2-methylpropionic acids |
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Authors: | S -L Wu T -S Chen |
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Institution: |
a Department of Chemical Engineering, Tatung University, Taipei, Taiwan 104, ROC |
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Abstract: | A homologous series of chiral compounds, (R)-6-(3-alkoxy-2-methylpropionyloxy)-2-naphthyl 4-alkoxybenzoates, nMPNmB (n?=?2-5, m?=?6-13), derived from methyl (R)-3-hydroxy-2-methylpropionate, was prepared for the study of mesormorphic phases. The mesophases were determined mainly by their microscopic textures and identified by the racemic modification. The results show that most of these compounds displayed frustrated phases BP, TGBA* and TGBC*, and the N*phase. Moreover, the thermal stability of the frustrated phases is significantly affected by the length of the alkyl chain in both achiral and chiral groups of the compounds. The spontaneous polarization in the TGBC* phase of compounds nMPN10B in a surface-stabilized geometry was measured, giving Ps values of about 20?nC?cm-2. |
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