本篇主要藉由引入一OH官能基及取代硬端結構，去探討分子間作用力的增加，及改變側鏈基碳數，對於液晶相形成所產生之影響。所有化合物經由1H-NMR、13C-NMR與元素分析鑑定其結構及純度；液晶相性質則是利用偏光顯微鏡(POM)來對相的種類作初步觀察，再以熱微差掃描分析儀(DSC) 測量相變化之溫度與熱焓值，變溫粉末繞射儀(XRD)量測液晶相之特徵峰，進一步判定液晶相種類。 系列一合成一系列由salicyladimines衍生出的配位基，並分別與 Pd2+ 、 VO2+和Cu2+金屬進行配位後，形成含有單及雙金屬的錯合物，配位基與單金屬錯合物皆具有SmA相。並與文獻化合物比較其液晶相性質。 系列二合成以不對稱pyrazole結構為中心之液晶分子，與Cu2+、Al3+金屬分別形成四配位與六配位之錯合物，配位基與錯合物呈現SmA、SmC或兩者皆有的液晶相。而與文獻化合物比較後，顯示硬端比例的增加，的確有助於液晶相的形成。 系列三合成oxadiazole和thiadiazole之衍生物，由實驗數據得知，oxadiazole衍生物，具有短範圍的N或SmC相；而thiadiazole衍生物則具有較廣範圍的N/SmA/SmC相。 In this thesis, we investigated the relationship between inter-molecular interactions and mesomorphic properties through substitution partial structures. All compounds were characterized by 1H, 13C-NMR spectroscopy and element analysis. The phase behaviors of these compounds were studied by polarized optical microscopy (POM), differential scanning calorimetry (DSC), powder X-ray diffraction (XRD). Ligand 2a were derivated from salicyladimines. Pd2+ and VO2+ ions formed mononuclear complexes (1a, 1b), whereas, Cu2+ ion formed binuclear complexes (1c) . Series 2a, 1a and 1b exhibited SmA phase. We also compared mesomorphic properties with similar structures. Ligand 4a were derivated from unsymmetric pyrazoles. Froming four coordination complexes (3a) with Cu2+ ions, whereas, Al3+ ions fromed six coordination complexes (3b). Ligands and complexes exhibited smectic phase. Compared with similar structures, we proved that it is helpful for formation of mesophase by increasing rigid core proportion. Finally, series 6a and 6b were oxadiazole and thiadiazole derivatives. 6a exhibited a short range of nematic (N) or smectic C (SmC) mesophases. The thiadiazole derivatives, 6b, formed nematic (N), smectic A (SmA) and smectic C (SmC) phases over a wide range of temperatures.
