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The synthesis and dielectric properties of a new phenylbenzoate-based calamitic liquid crystal
Journal of the Iranian Chemical Society ( IF 2.4 ) Pub Date : 2020-08-04 , DOI: 10.1007/s13738-020-02021-x
Esma Ahlatcıoğlu Özerol , Hale Ocak , Belkız Bilgin Eran , Selvi Karavelioğlu

The dielectric investigation has a great importance in liquid crystal studies as a supportive method to DSC for a complete characterization of liquid crystals as well as in the electronic applications. In this study, the synthesis, mesomorphic characterization and dielectric properties of a new phenylbenzoate-based three-ring calamitic liquid crystal which composed of ester linking groups, (S)-3,7-dimethyloctyloxy chiral unit at one of terminals and n-octyloxy chain at the other end of the molecule, have been reported. The new calamitic liquid crystal 4-[4-((S)-3,7-dimethyloctyloxy)phenoxy)carbonyl]phenyl 4-(n-octyloxy)benzoate (DPCPB) has been characterized using 1H, 13C-NMR and MS-QTOF. The liquid crystalline behavior of the target compound has been investigated by differential scanning calorimetry and optical polarizing microscopy. DPCPB exhibits an enantiotropic non-tilted smectic mesophase in a wide temperature range. The real and imaginary dielectric constant, conductivity mechanism, impedance and dielectric relaxation mechanism of DPCPB have been investigated depending on frequency at different temperatures.



中文翻译:

新型苯甲酸酯基钙钛矿液晶的合成与介电性能

介电研究在液晶研究中作为DSC的支持方法,对于液晶的完整表征以及在电子应用中都非常重要。在这项研究中,合成,介晶的表征和新的基于苯基苯甲酸-三环棒状液体,其组成酯连接基团的晶体,介电性能(S) - 3,7- -二甲基辛氧基手性单元在终端和一个Ñ -octyloxy已经报道了分子另一端的链。新的杆状液晶4- [4 - ((小号)-3,7-二甲基辛氧基)苯氧基)羰基]苯基4-(Ñ -octyloxy)苯甲酸甲酯(DPCPB)已被使用,其特征在于1H,13 C-NMR和MS-QTOF。通过差示扫描量热法和光学偏振显微镜研究了目标化合物的液晶行为。DPCPB在较宽的温度范围内表现出对映非倾斜的近晶中间相。根据不同温度下的频率,研究了DPCPB的实,虚介电常数,电导率机制,阻抗和介电弛豫机制。

更新日期:2020-08-05
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