Converting Nonliquid Crystals into Liquid Crystals by N-Methylation in the Central Linker of Triazine-Based Dendrimers

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• 作者：Meng-Jung Tsai ; Jei-Way Hsieh ; Long-Li Lai ; Kung-Lung Cheng ; Shih-Hsien Liu ; Jey-Jau Lee ; Hsiu-Fu Hsu
• 刊名：Journal of Organic Chemistry
• 出版年：2016
• 出版时间：June 17, 2016
• 年：2016
• 卷：81
• 期：12
• 页码：5007-5013
• 全文大小：528K
• 年卷期：0
• ISSN：1520-6904

文摘

Two triazine-based dendrimers were successfully prepared in 60–75% yields. These newly prepared dendrimers 2a and 2b containing the −NMe(CH₂)₂NMe– and the −NMe(CH₂)₄NMe– linkers between two G₃ dendrons, respectively, exhibit columnar phases during the thermal process. However, the corresponding dendrimers 1a and 1b containing the −NH(CH₂)₂NH– and the −NH(CH₂)₄NH– linkers between two G₃ dendrons, respectively, do not show any LC phases on thermal treatment. Computational investigations on molecular conformations reveal that N-methylation of the dendritic central linker leads dendrimers to possess more isomeric conformations and thus successfully converts non-LC dendrimers (1a and 1b) into LC dendrimers (2a and 2b).