The ferro-, ferri- and antiferro-electric properties of a series of novel 2- or 3-substituted-alkyl 4-(4'-dodecyloxybiphenyl-4-carbonyloxy)-benzoate esters |
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| Authors: | Christopher J Booth David A Dunmur John W Goodby Kenneth J Toyne |
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| Institution: |
a The School of Chemistry, The University of Hull, Hull, UK
b Sharp Laboratories of Europe Ltd, Oxford, UK
c Centre for Molecular Materials, The Department of Chemistry, The University, Sheffield, UK |
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| Abstract: | This paper reports the synthesis of six chiral liquid crystalline 2- or 3-substituted-alkyl 4-(4'-dodecyloxybiphenyl-4-carbonyloxy)benzoates, their mesophase assignments and the phase transition temperatures. All six materials display S*A followed by S*C phases on cooling from their isotropic liquids. The magnitudes of switched tilt angle, spontaneous polarization, helical twist sense (L.H.) and direction of polarization (Ps(-)) are given for the S*C phases. Close inspection of the S*C phases revealed that for the six compounds, two showed a ferrielectric (S*Cγ) and an antiferroelectric (S*A) subphase, two showed only a ferrielectric subphase and one showed only an antiferroelectric subphase. The field-dependent behaviour of the switched tilt angle of the ferrielectric and antiferroelectric phases of some of the compounds is also presented. |
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