Highly tilted antiferroelectric (R) enantiomers useful for the formulation of eutectic mixtures |
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Authors: | M Urbańska O Strze?ysz M Szala |
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Institution: | 1. Institute of Chemistry, Military University of Technology , Warsaw, Poland mzurowska@o2.pl https://orcid.org/0000-0001-6824-363X;3. Institute of Chemistry, Military University of Technology , Warsaw, Poland https://orcid.org/0000-0002-4862-5726;4. Institute of Chemistry, Military University of Technology , Warsaw, Poland https://orcid.org/0000-0002-6928-2689 |
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Abstract: | ABSTRACT Novel chiral three-ring (R) enantiomers were synthesised using optically active (R)-(?)-2-octanol. Properties, such as the sequence of phases, the transition temperatures and enthalpies, were tested by a polarising optical microscope and differential scanning calorimeter. An antiferroelectric smectic phase (SmCA*) with a direct transition from the antiferroelectric to the isotropic phase (SmCA*-Iso) was observed for three esters with an achiral C3F7CH2O(CH2)3O– terminal chain. Bi- and multicomponent mixtures with a broad temperature range of the antiferroelectric phase and good electro-optical properties were formulated. Helical pitch of pure esters and mixtures was measured by spectrophotometry method. |
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Keywords: | (R) enantiomers high tilted smectics eutectic mixtures helical pitch tilt angle spontaneous polarisation |
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