Description

• Title:
  Zwitterionic pyridinium derivatives of [closo-1-CB_9H_10]− and [closo-1-CB_11H_12]− as high Δε additives to a nematic host
• Creator:
  Pecyna, Jacek;
  Pociecha, Damian;
  Kaszynski, Piotr
• Contributor:
  Vanderbilt University, Department of Chemistry;
  University of Warsaw, Department of Chemistry;
  University of Łódź, Faculty of Chemistry;
  piotr.kaszynski@vanderbilt.edu
• Description:
  Substituted closo-carbaborate–pyridinium zwitterions were prepared in 35–50% yield by reacting 1-amino-closo-1-carbaborates with 4-alkoxypyrylium triflates. Two of the new materials, 1[6]d and 2[10]b, exhibit a high temperature SmA phase, whose stability is driven by dipolar interactions. Solution studies in a nematic host, ClEster, demonstrated high positive dielectric anisotropy of these new compounds (Δε ≈ +50) resulting from a longitudinal molecular dipole moment of about 20 D.;
  This work was supported by the NSF grant DMR-1207585. We are grateful to Professor Roman Dąbrowski of Military University of Technology (Warsaw, Poland) for the gift of ClEster. We thank Ms. Amanda Doody for help with chiral HPLC analysis of 1[6]c.
• Object availability:
  free access
• Rights:
  Uznanie autorstwa 3.0 Polska;
  http://creativecommons.org/licenses/by/3.0/pl
• Date:
  2016.03.31;
  2013;
  2014
• Type:
  Article
• Language:
  English
• Format:
  application/pdf
• Publisher:
  Royal Society of Chemistry
• Relation:
  Journal of Materials Chemistry C;9;
  2
• Identifier: http://hdl.handle.net/11089/17589 ;
  10.1039/C3TC32351J
• Data provider:
  Repozytorium Uniwersytetu Łódzkiego
• Can I use it?:
  check license
• Type:
  image