Effects of Conformation of Diastereomer Liquid Crystals on the Preference of Antiferroelectricity

• Published in: Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals Molecular crystals and liquid crystals, 1999-08, Vol.328 (1), p.131-137
• Main Authors: Kobayashi, Ichiro, Hashimoto, Shigeharu, Suzuki, Yoshiichi, Yajima, Tomoko, Kawauchi, Susumu, Imase, Tatsuya, Terada, Masahiro, Mikami, Koichi
• Format: Article
• Language: English
• Subjects: AFLC; antiferroelectricity; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; conformation; diastereomer; Dielectric, piezoelectric, ferroelectric and antiferroelectric materials; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Experimental determinations of smectic, nematic, cholesteric, and other structures; ferroelectricity; Liquid crystals; Liquids and liquid crystals; Liquids, emulsions, and suspensions; liquid crystals; Physics; Structure of solids and liquids; crystallography
• ISSN: 1058-725X
• DOI: 10.1080/10587259908026053

We have already synthesized a new type of antiferroelectric liquid crystals (AFLCs) with double stereogenic centers, β-methyl-substituted TFMHPOBC(4-(1-trifluoromethyl-hepty-loxycarbonyl)phenyl 4′-octyloxybiphenyl-4-carboxylate) and its analogues, based on α-trifluoromethyl-β-methylcarbinol, and its conformational effects on the antiferroelectricity [1-5] . Now we report another new type of AFLC and ferroelectric liquid crystals (FLC) with double stereogenic centers bearing β-trifluoromethylcarbinol. which can be regarded as a β-trifluoromethyl-substituted MHPOBC(4-(methylheptyloxycarbonyl)phenyl 4′-octyloxybiphenyl-4-carboxylate) analogue, and examined its properties such as the phase transition. From these results and ab initio calculations using Gaussian 94 program, we conclude that their conformations strongly affect their preference of antiferroelectricity and that the bend-like structure is more essential for the appearance of antiferroelectricity, than the extended-like one.