教師資料查詢 | 類別: 期刊論文 | 教師: 徐秀福 Hsiu-fu Hsu (瀏覽個人網頁)

標題:Induction of the Columnar Phase of Unconventional Dendrimers by Breaking the C2 Symmetry of Molecules
學年101
學期1
出版(發表)日期2012/11/26
作品名稱Induction of the Columnar Phase of Unconventional Dendrimers by Breaking the C2 Symmetry of Molecules
作品名稱(其他語言)
著者Lai, Long-Li; Wang, Sheng-Wei; Cheng, Kung-Lung; Lee, Jey-Jau; Wang, Tsai-Hui; Hsu, Hsiu-Fu
單位淡江大學化學學系
出版者Weinheim: Wiley - V C H Verlag GmbH & Co. KGaA
著錄名稱、卷期、頁數Chemistry - A European Journal 18(48), pp.15361-15367
摘要Two triazine-based unconventional dendrimers were prepared and characterized by 1H and 13C NMR spectroscopy, mass spectrometry, and elemental analysis. Differential scanning calorimetry, polarizing microscopy, and powder XRD studies showed that these dendrimers display columnar liquid-crystalline phases during thermal treatment. This is ascribable to breaking of their C2 symmetry. The molecular conformations of prepared dendrimers were obtained by computer simulation with the MM3 model of the CaChe program in the gas phase. The simulation showed that the conformations of the prepared dendrimers are rather flat and disfavor formation of the LC phase. However, due to C2-symmetry breaking, the prepared dendrimers have structural isomers in the solid state and thus show the desired columnar phases. This new strategy should be applicable to other types of unconventional dendrimers with rigid frameworks.
關鍵字dendrimers;liquid crystals;nitrogen heterocycles;symmetry breaking
語言英文(美國)
ISSN1521-3765;0947-6539
期刊性質國外
收錄於SCI;
產學合作
通訊作者Lai, Long-Li
審稿制度
國別德國
公開徵稿
出版型式電子版;紙本;
相關連結
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