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Materials 2016, 9(5), 360; doi:10.3390/ma9050360

Diketonylpyridinium Cations as a Support of New Ionic Liquid Crystals and Ion-Conductive Materials: Analysis of Counter-Ion Effects

1
Departamento Química Inorgánica I, Facultad CC. Químicas, Universidad Complutense, Madrid E-28040, Spain
2
Departamento Física Aplicada III, Facultad CC. Físicas, GFMC, Universidad Complutense, Madrid E-28040, Spain
3
Laboratorio de Difracción de Rayos-X, Facultad CC. Químicas, Universidad Complutense, Madrid E-28040, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Carlos Lodeiro
Received: 4 March 2016 / Revised: 21 April 2016 / Accepted: 5 May 2016 / Published: 12 May 2016
(This article belongs to the Special Issue Selected papers from ISN2A2016)
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Abstract

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. View Full-Text
Keywords: ionic salts; liquid crystals; ionic liquid crystals; smectic mesophase; polymorphism; ionic conductivity ionic salts; liquid crystals; ionic liquid crystals; smectic mesophase; polymorphism; ionic conductivity
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Pastor, M.J.; Cuerva, C.; Campo, J.A.; Schmidt, R.; Torres, M.R.; Cano, M. Diketonylpyridinium Cations as a Support of New Ionic Liquid Crystals and Ion-Conductive Materials: Analysis of Counter-Ion Effects. Materials 2016, 9, 360.

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