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Insight into Out-of-Layer Fluctuations in the Smectic A Stability of 3,5-Diarylisoxazole Liquid Crystals.
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-06-03 , DOI: 10.1002/cphc.202000276 Eric S Sales 1 , Gabriel M Dos Santos 1 , Richard J Mandle 2, 3 , Wallison C Costa 4 , Ivan H Bechtold 4 , Itamar L Gonçalves 5 , Vera L Eifler-Lima 5 , Aloir A Merlo 1
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-06-03 , DOI: 10.1002/cphc.202000276 Eric S Sales 1 , Gabriel M Dos Santos 1 , Richard J Mandle 2, 3 , Wallison C Costa 4 , Ivan H Bechtold 4 , Itamar L Gonçalves 5 , Vera L Eifler-Lima 5 , Aloir A Merlo 1
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Polar‐terminated 3,5‐diarylisoxazole liquid crystals (ILCs) were synthetized and characterized. ILCs are composed by rigid core 3,5‐diarylisoxazol, alkyl chain and polar‐terminated flexible spacer. Hydroxyl‐, ketal‐ and 1,2‐diol‐terminated ILCs rendered smectic C and A mesophase, while bromine‐terminated ILCs showed smectic A and B mesophase, for monosubstituted and linear ILCs. For branched alkyl chain monotropic SmA was detected and for disubstituted ILCs no mesophase was detected. Out‐of‐layer fluctuations (OLFs) are discussed based on X‐ray diffraction date and textures. The OLFs are dependent on the bromine atom hardness, hydrogen bonding through collective actions and conformational effects at the interface between layers. Smectic translational order parameter (TOP) Σ was also obtained for orientated bromine‐ and hydroxyl‐terminated ILCs and related it with OLFs. For 1,2‐diol‐terminated ILCs two SmC sublayers were founded, probably related to the intramolecular hydrogen bond favoring the 5‐membered and 6‐membered formation.
中文翻译：
深入了解3,5-二芳基异恶唑液晶的近晶层A稳定性的层外波动。
合成并表征了极性封端的3,5-二芳基异恶唑液晶（ILC）。ILC由刚性核心3,5-二芳基异唑，烷基链和极性终止的柔性间隔基组成。对于单取代和线性ILC，羟基，缩酮和1,2-二醇封端的ILC呈现近晶C和A中间相，而溴封端的ILC显示出近晶A和B中间相。对于支链烷基链，检测到单向SmA，对于双取代ILC，未检测到中间相。基于X射线衍射数据和纹理讨论了层外波动（OLF）。OLF取决于溴原子的硬度，通过集体作用产生的氢键以及层之间界面处的构象效应。还获得了定向溴和羟基封端的ILC的近晶翻译顺序参数（TOP）Σ，并将其与OLF相关。对于1,2-二醇封端的ILC，建立了两个SmC亚层，可能与分子内氢键有关，有利于5元和6元形成。
更新日期：2020-06-03
中文翻译：
深入了解3,5-二芳基异恶唑液晶的近晶层A稳定性的层外波动。
合成并表征了极性封端的3,5-二芳基异恶唑液晶（ILC）。ILC由刚性核心3,5-二芳基异唑，烷基链和极性终止的柔性间隔基组成。对于单取代和线性ILC，羟基，缩酮和1,2-二醇封端的ILC呈现近晶C和A中间相，而溴封端的ILC显示出近晶A和B中间相。对于支链烷基链，检测到单向SmA，对于双取代ILC，未检测到中间相。基于X射线衍射数据和纹理讨论了层外波动（OLF）。OLF取决于溴原子的硬度，通过集体作用产生的氢键以及层之间界面处的构象效应。还获得了定向溴和羟基封端的ILC的近晶翻译顺序参数（TOP）Σ，并将其与OLF相关。对于1,2-二醇封端的ILC，建立了两个SmC亚层，可能与分子内氢键有关，有利于5元和6元形成。
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