Ionic Liquid Crystals Based on Mesitylene-Containing Bis- and Trisimidazolium Salts

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• 作者：Montserrat Trilla ; Roser Pleixats ; Teodor Parella ; Christophe Blanc ; Philippe Dieudonn&eacute ; Yannick Guari ; Michel Wong Chi Man
• 刊名：Langmuir
• 出版年：2008
• 出版时间：January 1, 2008
• 年：2008
• 卷：24
• 期：1
• 页码：259 - 265
• 全文大小：378K
• 年卷期：v.24,no.1(January 1, 2008)
• ISSN：1520-5827

文摘

The synthesis of novel ionic liquid crystals (ILCs) based on bis- and trisimidazolium salts (I^-, BF₄^-, and [N(SO₂CF₃)₂]^-)bearing hydrophobic hexadecyl chains and a bridging mesitylene moiety is reported. The study of their mesomorphicproperties is presented, including the characterization of the Smectic A phase by differential scanning calorimetry andpolarized optical microscopy. A detailed powder X-ray diffraction (p-XRD) study as a function of temperature confirmedthat cooling gives rise to a glass transition from the liquid-crystalline smectic A phase to a metastable lamellar phase.In addition, in the case of bisimidazolium iodide, the ability of these molecules to form self-aggregates in solutionhas been demonstrated by diffusion nuclear magnetic resonance (NMR) experiments.