含氮雜環之盤狀雙聚液晶的研究並不多。本論文即分成四個部份，分別針對含氮雜環之盤狀雙聚分子之合成及液晶性質進行探討。

論文第一部分中，我們設計了新型以dibenzo[a,c]phenazine為架構之雙聚分子，以期產生液晶相。調整中間橋基為6個碳後，確可產生柱型液晶相，橋基碳鏈增長，液晶穩定溫度範圍變廣。同時，亦改變周圍碳鏈，探討周圍碳數對液晶相形成之影響。

論文第二部分中，以dibenzoquinoxaline為架構之分子，分子平面性較差，因而無法產生液晶相。

論文第三部分，仍是以dibenzoquinoxaline為架構之香蕉型分子，以期具有特殊之液晶相。

論文第四部分為延續實驗過去以5,6,11,12,17,18-hexaazatri
-naphthylene為架構之液晶而合成之雙聚分子，我們預期其可以作為缺電性材料。

The scarcity of research about nitrogen containing heterocyclic discotic liquid crystal has made it an interesting subject for chemists. In this thesis, we will discuss the synthesis and properties of four kinds of new dimeric discotic liquid crystal in details.

The first type of new dimeric discotic liquid crystals were synthesized based on a novel core structure, dibenzo[a,c]phenazine. All dimers linked by a hexyl-chain spacer exhibited columar phase. The range of mesomorphic temperature became wide as the chain length of spacer increased. Simultaneously, we also changed terminal chain length to investigate the influence on mesomorphic properties by attached terminal group.

The second type of new dimeric discotic liquid crystals, which contained the dibenzoquinoxaline skeleton, didn’t show the properties of mesomorphic phase due to the poverty of planality.

The third type of molecules, which also have the dibenzoquinoxaline skeleton, were the banana-shaped discotic liquid crystals. We anticipated these dimeric molecules would demonstrate another special mesogenic phase.

The last type of dimeric discotic liquid crystals were the extension of our previously research. These molecules, which comprised 5,6,11,12,17,18- hexaazatrinaphthylene skeleton, would be good candidates for using as a n-type material.

中文摘要 Ⅰ
英文摘要 Ⅱ
目錄 Ⅲ
第一章 前言
1-1 液晶之分類 1
1-2 盤狀液晶 6
1-3 盤狀液晶之應用 11
1-4 盤狀雙聚液晶之簡介 14
1-5 盤狀雙聚液晶之論文回顧 16
1-6 玻璃態 27
第二章 實驗儀器與原理
2-1 實驗儀器及藥品 31
2-2 實驗原理及液晶相鑑定
2-2-1 偏光顯微鏡(Polarizing microscope) 34
2-2-2 微差掃描熱卡計(Differential Scanning Calorimetry) 38
2-2-3 X光粉末繞射(Powder X-ray Diffraction) 41
第三章 合成盤狀雙聚液晶及討論
3-1 盤狀雙聚液晶之合成動機及目的 46
3-2 以Dibenzo[a,c]phenazine為架構之盤狀雙聚液晶—系列一
以Biquinoxaline為架構之盤狀雙聚液晶—系列二
3-2-1 合成策略 47
3-2-2 合成方法探討及合成結果 48
3-3 以Biquinoxaline為架構之盤狀雙聚液晶—系列三
3-3-1 合成策略 55
3-3-2 合成方法探討及合成結果 56
3-4 以5,6,11,12,17,18-Hexaazatrinaphthylene為架構之盤狀雙聚
液晶—系列四
3-4-1 合成策略 60
3-4-2 合成方法探討及合成結果 62
第四章 液晶相鑑定及探討
4-1 以Dibenzo[a,c]phenazine為架構之盤狀雙聚液晶—系列一
以Biquinoxaline為架構之盤狀雙聚液晶—系列二
4-1-1 系列一之液晶相鑑定及探討 65
4-1-2 系列二之液晶相鑑定及探討 97
4-1-3 其他物性探討 100
4-2 以Biquinoxaline為架構之雙聚盤狀液晶—系列三 104
第五章 實驗步驟
5-1 以Dibenzo[a,c]phenazine為架構之盤狀雙聚液晶—系列一
以Biquinoxaline為架構之盤狀雙聚液晶—系列二 108
5-2 以Biquinoxaline為架構之雙聚盤狀液晶—系列三 129
5-3 以5,6,11,12,17,18-Hexaazatrinaphthylene為架構之盤狀雙聚
液晶—系列四 136
第六章 結論與參考文獻 138

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