盤狀液晶材料具有可吸收可見光區發色團為桿狀液晶所欠缺的且自我排列形成柱狀液晶相結構時，位於柱狀結構中心部分之高電子密度芳香環分子間其π-軌道順向性的互相重疊，有較高的電子移動率。
本研究為新型官能基之盤狀液晶，合成以含有3,6,11個不同長度碳鏈作為立體空間的新型六角柱狀液晶9-{11-[2,3,6,7-四(正己氧烷基)二苯駢[a,c]二氮蔥羧氧烷基]}

Discotic liquid crystals(DLCs) in this research absorb the light in visible region of spectrum, this characteristic is not found in rod-like liquid crystals. A majority of discotic liquid crystals form columnar mesophases probably due to intense π-π interactions of polyaromatic cores. π-π interactions are caused by intermolecular overlapping of p-orbitals in π-conjugated systems, so they become stronger as the number of π-electrons increases.

Three new hexagonal columnar disctic liquid crystals 9-{11-[2,3,6,7-tetrakis(hexyloxy)dibenzo[a,c]phenazinylcarboxyalkyl]} have been successfully synthesized by covalently attaching carbazole moiety to a tetrakis (hexyloxy)dibenzo[a,c]phenazinyl core with an ester group containing different lengths of alkyl spacer having 3,6,and 11 carbon atoms.

In order to set up a basic data base, we measure and analyze the discotic liquid crystals via various instruments.In addition, we also utilize both simulation systems of MMM and QMM to predict several molecular dynamics and properties such as: vibration, rotation, motion and heat of formation and so on.So we can see more depth inside how the concentration effects on the geometry structure arrangement of the discotic liquid crystals.

誌謝…………………………………………………………I
摘要 ………………………………………………………II
ABSTRACT……………………………………………….III
目錄 ………………………………………………………IV
圖目錄 …………………………………………………VI
表目錄 ……………………………………………………X
第一章 緒論
1.1前言……………………………………………………1
1.2液晶的發現……………………………………………2
1.3液晶分類………………………………………………6
1.4液晶相之現象及一般性質 …………………………12
1.5常見之盤狀液晶化合物 ……………………………15
1.6液晶相之鑑定 ………………………………………16
1.7研究動機與目的 ……………………………………20
第二章 實驗
2.1藥品 …………………………………………………23
2.2 盤狀液晶材料合成 …………………………………24
2.3 實驗儀器及測試方法 ………………………………28

第三章 模擬
3.1 計算化學 ……………………………………………32
3.2 分子力學模擬 ………………………………………33
3.3 量子力學模擬 ………………………………………42
3.4 分子軌域 ……………………………………………46
第四章 結果與討論
4.1 液晶熱分析討論 …………………………………52
4.2 液晶相及結構形態之觀察 …………………………56
4.3 液晶光學性質探討 …………………………………64
4.4 薄膜液晶材料特性探討 ……………………………73
第五章 總結 ……………………………………………77
參考資料 ………………………………………………78

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