含pyrazole及isoxazole之有機桿狀液晶; β-Diketone, Pyrazole and Isoxazole Derivatives with Polar Groups: Liquid Crystalline and Thermodynamic Properties

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题名:	含pyrazole及isoxazole之有機桿狀液晶;β-Diketone, Pyrazole and Isoxazole Derivatives with Polar Groups: Liquid Crystalline and Thermodynamic Properties
作者:	蔡韶玲;Shao-Ling Tsai
贡献者:	化學研究所
关键词:	有機桿狀液晶;isoxazole;pyrazole
日期:	2007-07-09
上传时间:	2009-09-22 10:14:35 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本篇論文主要包含具有pyrazole結構以及isoxazole結構之有機液晶。所有化合物經由1H-NMR、13C-NMR、Mass與元素分析以鑑定其結構及純度，液晶相性質則是利用偏光顯微鏡(POM)來觀測相種類及熱微差掃描分析儀(DSC)測量相變化時之溫度與熱焓值，最後以變溫粉末X光繞射儀(XRD)確認相的種類。系列一：合成出具有pyrazole結構的液晶分子，探討不同碳數(n = 8、10、12、14、16) 對液晶相的影響以及在pyrazole上N-H位置取代三種不同官能基，分別為甲基、乙醇基、啶基，利用取代基賦予不同的分子間作用力，而在化學及物理性質上做探討;合成出具有isoxazole結構之有機液晶，探討不同碳數(n =8、10、12、14、16) 對液晶相的影響; 系列二：合成出具有pyrazole環不對稱結構之有機液晶Hpz-C16-OH，具有SmA相。 In this serie, we report the synthesis, characterization and mesomorphic properties of two series of new mesogenic derivatives based on pyrazole and isoxazole structures. All compounds were characterized by 1H, 13C-NMR spectroscopy and elemental analysis. The phase behaviors of these mesogenic compounds were characterized and studied by differential scanning calorimeter (DSC) and polarization optical microscope. In serie one, a new type of mesogenic compounds derived from heterocyclic pyrazole and isoxazole (Iz-Cn) were prepared and studied. All compounds exhibited smectic phases depending on the carbon length attached. Replacing hydrogen atom of pyrazole by methyl group (Mpz-Cn), ethanol group (Epz-Cn) and pyridinal group (Ppz-Cn) were carried out and the mesomorphic behavior studied. In serie two, we designed and characterized a series of asymmetrical of organic molecules Hpz-Cn-OH derived from pyrazole with one side chains. These compounds exhibited smectic phases.
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