Bilayered Super-Structures of Antiferroelectric Mesogens |
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| Authors: | Kenji Okuyama Naoko Kawano Souichi Uehori Keiichi Noguchi Nobuhiro Okabe Yoshiichi Suzuki |
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| Institution: | 1. Faculty of Technology, Tokyo University of Agriculture and Technology , Koganei, Tokyo , 184 , Japan;2. Central Recearch and Development Laboratory, Showa Shell Sekiyu Co. Ltd , 123-1 Shimokawairi, Atsugi , 243-02 , Japan |
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| Abstract: | Abstract Crystal structures of two antiferroelectric mesogens, TFMHPBC and MHPBC-10, were analysed by an X-ray diffraction method. In both crystals, mesogen molecules formed a herringbone structure which was essentially the same as that proposed for the antiferroelectric liquid crystal phase. Because of the crystallographic 21-symmetry along the b-axis, only the b-axis component of the dipole moment remains in a smectic layer. Since the dipole moment in the next layer has the same magnitude but the opposite direction, both crystals show no dipole moment as a whole. These structural features observed in their crystal states seem to be conserved in their antiferroelectric liquid crystal phases which are just above their crystal phases. |
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