Ferroelectric Liquid Crystals. Part 9. Laterally substituted phenyl benzoates incorporating atrans-1,4-disubstituted cyclohexane ring
作者:Stephen M. Kelly
DOI:10.1002/hlca.19890720319
日期:1989.5.3
About 65 diverse phenylbenzoatesincorporating a trans-1,4-disubstituted cyclohexanering and at least one lateral substituent have been synthesised. The dependence of the liquid-crystal transition temperatures of these materials on various lateral substituents (F, Cl, CN, and Br) in different positions of the esters has been investigated systematically. The influence of up to four F-atoms in various
Influence of fluoro substituents on the mesophase behaviour of banana-shaped molecules
作者:J. P. Bedel、J. C. Rouillon、J. P. Marcerou、M. Laguerre、H. T. Nguyen、M. F. Achard
DOI:10.1039/b201467j
日期:2002.7.26
Three new series of bent-shaped five-ring liquid crystals, based on the ester of isophthalic acid as the central core and azomethine linkages, are presented. They differ by the number and the position of halogeno substituents on the outer rings. This lateral substitution strongly influences the type of mesophases formed. Calculations were performed to determine the modification of the distribution of charge along the different molecules.
Wide blue phase range observed in simple binary mixture systems containing rodlike racemic biphenyl mesogens with 2-octyloxy tails
作者:Chiung-Cheng Huang、Chang-Yi Guo、Wei-Cheng Hsieh、Chih-Yi Fang、Jian-Fu Chiou、Ming-Jiun Shyu、Bo-Hao Chen、I-Jui Hsu、Jey-Jau Lee
DOI:10.1039/c6ra20799e
日期:——
of simple and rodlike racemic biphenyl mesogens possessing a 2-octyloxy tail and different substituents at the inner-core position of the phenyl ring were easily prepared. The mesophases of these racemic biphenyl mesogens were confirmed by variable-temperature XRD and the characteristic texture of POM. In general, cubic BPs can be induced by adding an appropriate ratio of chiral additive S811 or ISO(6OBA)2
容易制备四个具有2-辛氧基尾和在苯环的内核位置具有不同取代基的简单和棒状外消旋联苯介晶。这些外消旋联苯液晶元的中间相通过可变温度XRD和POM的特征结构得到证实。通常,在加热和冷却过程中,将适当比例的手性添加剂S811或ISO(6OBA)2添加到这些外消旋联苯液晶元中,可以诱发立方BP 。有趣的是,BPIII(5–6 K)在高手性条件下很容易控制由单取代联苯液晶元和手性掺杂剂S811组成的混合混合物。另外,当化合物C 6 OBiPhI-OH与35 wt%S811在冷却过程中混合时,BPIII的形成温度接近室温(36°C)。混合体系中存在的20 K以上的稳定BP由手性掺杂剂ISO(6OBA)2组成,没有取代的联苯液晶元C n OBiPhI-H或二氟取代的C n OBiPhI-FF。值得注意的是,通过在联苯化合物C 6 OBiPhI-H中仅添加10 wt%具有高HTP的手性掺杂剂ISO(6OB
Synthesis, thermal, dielectric and electro-optic properties of new series of fluorinated hydrogen-bonded liquid crystals
作者:Mouna Derbali、Taoufik Soltani、Ahlem Guesmi、Naoufel Ben Hamadi、Erwann Jeanneau、Yves Chevalier
DOI:10.1016/j.molliq.2022.120510
日期:2022.12
liquid–Nematic–SmA–SmC–crystalline solid upon cooling from the isotropic phase. All the transition temperatures decrease with increasing alkoxy chain length of nOBAFF, which reveals a decrease of order parameter for longer chains. The dielectric and electro-optic behaviors of the nematic phase of nOBAFF/8OBA mixtures reveal a decrease of the threshold voltage and response time upon increasing the alkyl chain length
Alkylsubstituierte Hydrochinonderivate zur Verwendung in ferroelektrischen Flüssigkristallmischungen
申请人:HOECHST AKTIENGESELLSCHAFT
公开号:EP0603786A2
公开(公告)日:1994-06-29
Ferroelektrische Flüssigkristallmischung, enthaltend mindestens eine Verbindung der Formel I,
in der die Symbole und Indizes folgende Bedeutung haben:
R8 ist Alkyl oder Halogen und
R1[-A1-M1]m-A2-M2 M3-A3[-M4-A4]n-R2 sind mesogene Reste.
Die Verbindungen der Formel I induzieren schon in geringen Mengen nematische Phasen, lassen aber wichtige Eigenschaften der Sc* Phase, wie Viskosität und Schaltwinkel, nahezu unbeeinflußt.
一种铁电液晶混合物,含有至少一种式 I 的化合物、
其中符号和指数具有如下含义:
R8 是烷基或卤素,以及
R1[-A1-M1]m-A2-M2 M3-A3[-M4-A4]n-R2 是介原基。
式 I 的化合物即使在少量情况下也能诱导向列相,但 Sc* 相的重要特性(如粘度和切换角)几乎不受影响。