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  4. New ionic mesogens with high ionic conductivity based on a cyanoborate building block and lipophilic or hydrophilic counter ions
 
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2024
Journal Article
Title

New ionic mesogens with high ionic conductivity based on a cyanoborate building block and lipophilic or hydrophilic counter ions

Abstract
New ionic mesogens have been prepared based on a cyanoborate head group, which is tethered to a lipophilic periphery via a short flexible spacer. As counter ions, either tetra-n-butyl ammonium cations or sodium and potassium cations stabilized by 18-crown-6 have been used. Although all compounds exhibit SmA enantiotropic mesomorphism, X-ray diffraction, modelling and solid-state NMR uncover distinct self-assembly of the LC materials in double layers. While the ammonium ions are located between the borate anions and are in contact with spacers and aromatic units, the crown ethers with the coordinated alkali metal cations are completely nanosegregated between two borate anion layers. Homogenous and homeotropic alignment has been achieved. Electrical impedance spectroscopy reveals ionic conductivity values in the single-ion conductor that are two to three orders of magnitude higher in the correctly-aligned samples. Values of ca. 10-4 S cm-1 in the SmA phase at 85 °C and 10-5 S cm-1 at 40 °C have been obtained.
Author(s)
Lehmann, Matthias
University of Würzburg, Institute of Organic Chemistry
Weinberger, Pascal
University of Würzburg, Institute of Organic Chemistry
Finze, Maik
Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron, University of Würzburg, Würzburg, Germany
Giffin, Guinevere A.
Fraunhofer-Institut für Silicatforschung ISC  
Weller, Mario
Julius-Maximilians-University Würzburg, Chemical Technology of Materials Synthesis, Faculty of Chemistry and Pharmacy
Bachmann, Stephanie
University of Würzburg, Institute of Organic Chemistry
Pöppler, Ann-Christin
University of Würzburg, Institute of Organic Chemistry
Journal
Journal of materials chemistry. C, Materials for optical and electronic devices  
DOI
10.1039/d4tc01045k
Language
English
Fraunhofer-Institut für Silicatforschung ISC  
Keyword(s)
  • cyanoborate head group

  • New ionic mesogens

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