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首页> 美国卫生研究院文献>Materials >Diketonylpyridinium Cations as a Support of New Ionic Liquid Crystals and Ion-Conductive Materials: Analysis of Counter-Ion Effects
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Diketonylpyridinium Cations as a Support of New Ionic Liquid Crystals and Ion-Conductive Materials: Analysis of Counter-Ion Effects

机译：二酮基吡啶鎓阳离子作为新型离子液晶和离子导电材料的载体：反离子效应分析

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摘要

Ionic liquid crystals (ILCs) allow the combination of the high ionic conductivity of ionic liquids (ILs) with the supramolecular organization of liquid crystals (LCs). ILCs salts were obtained by the assembly of long-chained diketonylpyridinium cations of the type [HOOR(n)pyH]+ and BF4−, ReO4−, NO3−, CF3SO3−, CuCl42− counter-ions. We have studied the thermal behavior of five series of compounds by differential scanning calorimetry (DSC) and hot stage polarized light optical microscopy (POM). All materials show thermotropic mesomorphism as well as crystalline polymorphism. X-ray diffraction of the [HOOR(12)pyH][ReO4] crystal reveals a layered structure with alternating polar and apolar sublayers. The mesophases also exhibit a lamellar arrangement detected by variable temperature powder X-ray diffraction. The CuCl42− salts exhibit the best LC properties followed by the ReO4− ones due to low melting temperature and wide range of existence. The conductivity was probed for the mesophases in one species each from the ReO4−, and CuCl42− families, and for the solid phase in one of the non-mesomorphic Cl− salts. The highest ionic conductivity was found for the smectic mesophase of the ReO4− containing salt, whereas the solid phases of all salts were dominated by electronic contributions. The ionic conductivity may be favored by the mesophase lamellar structure.
机译：离子液晶（ILC）允许将离子液体（IL）的高离子电导率与液晶（LC）的超分子组织结合在一起。通过组装[HOO R（n）pyH ] + 和BF4 -类型的长链二酮基吡啶鎓阳离子获得ILC盐， ReO4 -，NO3 -，CF3SO3 -，CuCl4 2-抗衡离子。我们已经通过差示扫描量热法（DSC）和热阶段偏振光光学显微镜（POM）研究了五种化合物的热行为。所有材料均显示出热致同质性和结晶多态性。 [HOO R（12）pyH ] [ReO4]晶体的X射线衍射显示层状结构具有交替的极性和非极性亚层。中间相还表现出通过可变温度粉末X射线衍射检测到的层状排列。由于熔融温度低和存在范围广，CuCl4 2-盐表现出最佳的LC性能，其次是ReO4 -盐。分别从ReO4 -和CuCl4 2-族的一种中探测中间相的电导率，在非同构Cl < sup>-盐。发现含ReO4 -的盐的近晶中间相具有最高的离子电导率，而所有盐的固相均受电子作用的支配。中间相层状结构可能有利于离子导电性。

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