Novel liquid crystals based on [1]benzothieno[3,2- b ][1]benzothiophene |
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Authors: | Bed ich Ko ata V clav Kozmik Ji í Svoboda Vladimí ra Novotn P emysl Van k Milada Glogarov |
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Institution: | Bedř,ich Koš,ata ,Vá,clav Kozmik,Jiř,í, Svoboda,Vladimí,ra Novotná,,Př,emysl Vaně,k,Milada Glogarová, |
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Abstract: | Four series of new 1]benzothieno3,2- b ]1]benzothiophene derivatives have been synthesized. In the non-chiral series a SmA phase occurs, while the chiral series exhibits a rather wide antiferroelectric SmC * A phase just below the SmA phase. The SmA-SmC * A phase transition has been studied using DSC and dielectric spectroscopy. In the SmC * A phase the spontaneous quantities have been measured. The tilt angle shows a typical temperature dependence and the values of spontaneous polarization are rather moderate. The length of the helical pitch increases on increasing the length of the non-chiral alkyl chain. |
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