First Photosensitive Liquid Crystalline Dendrimer: Synthesis, Phase Behavior, and Photochemical Properties

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• 作者：Natalia Boiko ; Xiaomin Zhu ; Alexey Bobrovsky ; and Valery Shibaev
• 刊名：Chemistry of Materials
• 出版年：2001
• 出版时间：May 2001
• 年：2001
• 卷：13
• 期：5
• 页码：1447 - 1452
• 全文大小：113K
• 年卷期：v.13,no.5(May 2001)
• ISSN：1520-5002

文摘

The first photosensitive liquid crystalline (LC) dendrimer with terminal cinnamoyl groupswas synthesized. A new approach to the synthesis of photochromic carbosilane LC dendrimerswas elaborated. The method consists of synthesis of dendrimer with terminal hydroxyl groupsand then coupling of 4-methoxycinnamoyl chloride to it. It was shown that the LC dendrimerof the first generation forms a smectic A (SmA) phase. The photochemical behavior of thedendrimer in dilute solution and in films was studied. The experimental data show that atleast two processes, E-Z photoisomerization and [2+2] photocycloaddition leading to theformation of the three-dimensional network, take place.