含pyrazole結構之液晶分子的設計與探討; Calamitic heterocyclic pyrazoles formed by 1,5-bis(4-alkoxyphenyl)-l,3,5-pentanetriones

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题名:	含pyrazole結構之液晶分子的設計與探討;Calamitic heterocyclic pyrazoles formed by 1,5-bis(4-alkoxyphenyl)-l,3,5-pentanetriones
作者:	周世祐;Shih-Yu Chou
贡献者:	化學研究所
关键词:	液晶分子;桿狀液晶;盤狀液晶;pyrazole;liquid crystal;mesophase
日期:	2008-07-07
上传时间:	2009-09-22 10:19:16 (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)確認其相的種類。系列化合物Tpz-Cn在n=6時呈現出SmA之液晶相，然後在n=8~16時則展現出SmC之液晶相。化合物Tpz-2Cn在n=6~16時即呈現出Colh的液晶相，然後我們將其配位基與NiCl2進行配位形成錯合物，其錯合物則展現出Colh之液晶。為了探討pyrazole上的NH對形成液晶是否為ㄧ重要因素，我們將NH取代成O原子合成出具有isoxazole結構之化合物，其相行為在n=12~16時皆為結晶相，因此可之NH對液晶行為有重大的影響。 In this thesis, we report the synthesis, characterization and mesomorphic properties of a series of new mesogenic derivatives based on pyrazole structureies. 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 the serie, a new type of mesogenic compounds derived from heterocyclic pyrazoles were prepared and studied. The compounds of Tpz-Cn, exhibited smectic phases, as expected for their rod-like structures, compounds of Tpz-2Cn, exhibited columnar hexagonal phases, as expected for their discotic-like structures. The metal complexes, Tpz-2Cn-Ni, formed by reacting the pyrazoles with NiCl2 are exhibited columnar hexagonal phases too.
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