盤狀液晶材料之設計與研究; The studys of the discotic liquid crystal

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/5873

Title:	盤狀液晶材料之設計與研究;The studys of the discotic liquid crystal
Authors:	溫長榮;Chang-Rong Wen
Contributors:	化學研究所
Keywords:	液晶;liquid crystal
Date:	2002-06-27
Issue Date:	2009-09-22 10:09:16 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	摘要系列一：設計並合成出一系列以2,5-bis(3,4,5-trialkoxyphenyl)-1,3,4-oxadiazoles為ligand與PdCl2配位而形成之無機盤狀液晶。所有之ligand均呈現hexagonal columnar phases(Colh)之盤狀液晶相。將這些有機ligand與PdCl2進行錯合反應即可得到含有 Pd金屬之錯合物。所得之所有化合物皆經由1H- and 13C-NMR光譜和元素分析加以鑑定其結構與純度，並且進一步利用單晶X光繞射解出分子的正確結構。而液晶現象的觀察、分析則藉助熱分析儀(DSC)、偏光顯微鏡(POM）以及粉末X光繞射(PXRD)來判斷。實驗結果顯示此系列含有Pd金屬之無機錯合物分子呈現出盤狀液晶相。當側鏈基碳數n=10、12或14時錯合物為rectangular columnar phase(Colr) 的液晶相。當側鏈基碳數n=16時則為hexagonal columnar Phase (Colh) 的液晶相。所有錯合物之液晶相範圍都比配位基之液晶範圍寬廣，且當側鏈基碳數n=10、12時呈現室溫液晶相。此系列錯合物形成液晶相與否的重要關鍵為分子結構中柔軟側鏈基的密度，當側鏈基數目為4或8時，錯合物皆不具液晶相，只有當側鏈基數目為12時此錯合物方具有液晶相。系列二：合成出一系列bis(1,3,4-oxadiazole)的有機液晶分子。經由熱分析儀(DSC)、偏光顯微鏡(POM)以及粉末X光繞射(PXRD)判斷出此系列化合物具有hexagonal columnar phases(Colh)之盤狀液晶相。當側鏈取代基數目為2時化合物為結晶相。取代基數目增加為4或6時，化合物為Colh之盤狀液晶相。而側鏈基數目為6，碳數n=12時為一「室溫液晶相」。除了液晶相關性質外，更進一步研究其OLED性質，藉由UV-Vis吸收光譜、PL放射光譜、螢光量子產率及循環電位儀(CV)對其相關性質作深入之探討。 Abstract A series of metal complexes：bis[2,5-bis(3,4,5-trialkoxyphenyl)- 1,3,4-oxadiazole]palladium (II), was prepared and characterized. Liquid crystalline properties of these palladium (II) complexes were studied and investigated by differential scanning calorimeter (DSC) and polarized optical microscopy (POM). The structures of the mesophases for palladium (II) complexes were also characterized and confirmed as rectangular columnar phase (Colr) or hexagonal columnar phase (Colh) depending on the carbon chain length by powder X-ray diffraction (XRD). The formation of mesophases was found to be sensitive to the numbers of the alkoxy side chains and the carbon length of the side chains. The results indicated that palladium (II) complexes with twelve alkoxy side chains exhibited columnar mesophases, however, all complexes with four or eight side chains showed only crystalline phase. The complexes with carbon length of 10, 12 and 14 displayed rectangular columnar phases (Colr) and the complex with carbon length of 16 displayed a hexagonal columnar phase (Colh). In fact, the complexes with carbon length of 10, 12 were room temperature liquid crystals. The crystal and molecular structures of the complex(comp. 3a, n =1) were determined by means of x-ray analysis. The complex was crystallizes in the monoclinic space group p21/c, with a = 8.7736(3) Å, b = 19.1568(6) Å, c = 15.7834(5) Å, β = 100.106(1)o, and Z=2.
Appears in Collections:	[Graduate Institute of Chemistry] Electronic Thesis & Dissertation

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