掌性盤狀化合物及盤狀雙聚物之合成及超分子堆疊探討

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题名:	掌性盤狀化合物及盤狀雙聚物之合成及超分子堆疊探討
其它题名:	Synthesis and supramolecular packing patterns of chiral discs and disc dimers in liquid crystalline states
作者:	詹益響;Chan, Yi-hsiang
贡献者:	淡江大學化學學系碩士班徐秀福;Hsu, Hsiu-fu
关键词:	筒型液晶;盤形向列型液晶;掌性;columnar phase;discotic nematic phase;chiral
日期:	2010
上传时间:	2010-09-23 16:12:03 (UTC+8)
摘要:	第一部分即利用金屬鉑為中心與二個筒型液晶原連結形成雙聚物，期望此雙聚物可以維持筒型排列並同時排列中心金屬單元。具較短連結體之的雙聚物因兩盤狀體無法共平面而形成較算散亂的為盤形向列相；延長連接體使兩盤狀體可共平面後多生成了筒狀液晶相，而將金屬移除後則只出現筒型排列且液晶溫度範圍縮小。第二部分於六炔苯基苯其中一個外圍苯環對位引入具掌性中心的側鏈，以探討對於分子螺旋構形及分子間螺旋堆疊的影響。將所合成出的掌性化合物與結構相似的非掌性化合物進行摻混，並利用偏光顯微鏡、掃描式穿隧電子顯微鏡與圓二色光譜儀能觀察到手性放大之效果。 In the first part of this thesis, a new design of mesogens using a platinum unit to bridge two mesogenic discs of pentaynylbenzene derivatives was reported for aligning the metal moieties in liquid crystalline states. A shorter bridge has caused steric hindrance between discs intramolecularly to give a less ordered nematic packing. On the other hand, a longer bridge makes a coplanar structure of the two discs possible to render the columnar suprastructure in addition to the nematic structure. In the second part of the thesis, one chiral chain was introduced onto one of the peripheral benzenes of the hexakisdialkoxy phenylenthynyl)benzene to affect the other five sidearms to induce a helical molecular conformation. All these compounds showed a columnar liquid crystalline phase within wide temperature ranges by differential scanning calorimetry, polarizing optical microscopy, and powder X-ray diffraction studies. Chiral induction by doping these chiral discogens into an achiral analogue was investigated by circular dichroism which exhibited chiral amplification by 1% doping.
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