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Open AccessArticle

New Pyrazolium Salts as a Support for Ionic Liquid Crystals and Ionic Conductors

1
Dpto. Química Inorgánica, Fac. CC. Químicas, Universidad Complutense, E-28040 Madrid, Spain
2
Dpto. Física de Materiales, Fac. CC. Físicas, GFMC, Universidad Complutense, E-28040 Madrid, Spain
*
Author to whom correspondence should be addressed.
Materials 2018, 11(4), 548; https://doi.org/10.3390/ma11040548
Received: 20 February 2018 / Revised: 21 March 2018 / Accepted: 28 March 2018 / Published: 3 April 2018
(This article belongs to the Special Issue Nanomaterials and Materials for Translational Research)
Ionic liquid crystals (ILCs) are a class of materials that combine the properties of liquid crystals (LCs) and ionic liquids (ILs). This type of materials is directed towards properties such as conductivity in ordered systems at different temperatures. In this work, we synthesize five new families of ILCs containing symmetrical and unsymmetrical substituted pyrazolium cations, with different alkyl long-chains, and anions such as Cl, BF4, ReO4, p-CH3-6H4SO3 (PTS) and CF3SO3 (OTf). We study their thermal behavior by polarized light optical microscopy (POM) and differential scanning calorimetry (DSC). All of them, except those with OTf as counteranion, show thermotropic mesomorphism. The observations by POM reveal textures of lamellar mesophases. Those agree with the arrangement observed in the X-ray crystal structure of [H2pzR(4),R(4)][ReO4]. The nature of the mesophases is also confirmed by variable temperature powder X-ray diffraction. On the other hand, the study of the dielectric properties at variable temperature in mesomorphic (Cl and BF4) and non-mesomorphic (OTf) salts indicates that the supramolecular arrangement of the mesophase favors a greater ionic mobility and therefore ionic conductivity. View Full-Text
Keywords: pyrazolium salts; liquid crystals; ionic liquid crystals; smectic mesophase; ionic conductivity pyrazolium salts; liquid crystals; ionic liquid crystals; smectic mesophase; ionic conductivity
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MDPI and ACS Style

Pastor, M.J.; Sánchez, I.; Campo, J.A.; Schmidt, R.; Cano, M. New Pyrazolium Salts as a Support for Ionic Liquid Crystals and Ionic Conductors. Materials 2018, 11, 548.

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