Ferroelectric liquid crystals with a thioester linking group positioned at the chiral tail |
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Authors: | S. -L. Wu Z. -L. Yang |
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Affiliation: | a Department of Chemical Engineering, Tatung University, 3rd sec., Taipei 104, Taiwan, ROC |
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Abstract: | A homologous series of chiral thioesters, hexyl (2S)-2-[6-(4-alkanoyloxyphenyl)benzoyloxy-2'-naphthyl]thiopropionates, HnPBNTP (n=7-11) was synthesized, and the mesophases and electro-optical properties were studied. All the materials possess a ferroelectric SmC* phase, which was confirmed by the switching current behaviour. It was found that compounds with a shorter alkyl chain length (n=7-9) displayed SmA* and SmC* phases, while, compounds with a longer alkyl chain length (n=10 and 11), displayed the SmC* phase exclusively. Spontaneous polarization and apparent tilt angle were also measured. The maximum Ps values are in the range 15-26 nC cm-2, and the maximum θ values are in the range 23°-28°. |
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