Regulating the mesogenic properties of imidazolium salts by modifying N3-substituents

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• 作者：Meng Wang ; Xu Pan ; Jian Chen ; Songyuan Dai
• 关键词：ionic liquid crystals ; mesogenic properties ; regulate ; N3 ; subsituents
• 刊名：SCIENCE CHINA Chemistry
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：58
• 期：12
• 页码：1884-1890
• 全文大小：838 KB
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• 作者单位：Meng Wang (1) (2)
  Xu Pan (2)
  Jian Chen (2)
  Songyuan Dai (2) (3)
  
  1. Anhui Electric Power Design Institute, Hefei, 230031, China
  2. Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, 230031, China
  3. Beijing Key Laboratory of Novel Thin Film Solar Cells, North China Electric Power University, Beijing, 102206, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Chinese Library of Science
  Chemistry
  
• 出版者：Science China Press, co-published with Springer
• ISSN：1869-1870

文摘

In this study, a series of imidazolium salts with different N3-substituents (3-position: methyl, vinyl, ethyl, n-propyl, n-butyl)-based ionic-liquid crystals with iodide as counterion (ILCs) are synthesized and characterized, with the aim of regulating the mesogenic properties of imidazolium salts. The imidazolium salts-based ionic-liquid crystals are characterized by thermal analysis, polarized optical microscopy, X-ray powder diffraction, and single-crystalline diffraction. Liquid crystalline phase with a Smectic A phase interdigitated bilayer structure is observed. The mesophase temperature range decreases with the increase of the alkyl chain length of N3-substituent. While when vinyl is attached to the N3 position, intermolecular π-π interactions are formed in adjacent layers, which exert a positive effect on the formation of mesophase. The layer-spacing of imidazolium salts keeps increasing with the increase of the alkyl chain length attached to both the N1 and N3 positions, and gradually decreases with the increasing temperature in liquid crystalline phase. The 1-alkyl-3-vinylimidazolium salt has the smallest layer-spacing, due to the intermolecular π-π interactions between the vinyl and imidazolium rings in adjacent layers. Keywords ionic liquid crystals mesogenic properties regulate N3-subsituents