Description

• Title:
  Liquid crystalline radicals: discotic behavior of unsymmetrical derivatives of 1,3,5-triphenyl-6-oxoverdazyl
• Creator:
  Jankowiak, Aleksandra;
  Pociecha, Damian;
  Szczytko, Jacek;
  Monobe, Hirosato;
  Kaszyński, Piotr
• Contributor:
  Vanderbilt Universit, Department of Chemistry;
  University of Warsaw, Department of Chemistry;
  University of Warsaw, Faculty of Physics;
  AIST Kansai Centre, National Institute of Advanced Industrial Science and Technology;
  University of Łódź, Faculty of Chemistry;
  piotr.kaszynski@vanderbilt.edu
• Description:
  A series of six 6-oxoverdazyl (1[10]) substituted with a total of three 3,4,5-tri(decyloxy)phenyl and/or 3,4,5-tri(decylsulfanyl)phenyl groups was investigated by thermal, XRD, spectroscopic, magnetic and photovoltaic methods. The compounds exhibit columnar hexagonal (1[10]c, Colh), columnar hexagonal ordered (1[10]b, Colh(o)), columnar hexagonal 3D (1[10]a, 1[10]e and 1[10]f, Colh(3D)) or a sequence of two phases (1[10]b, Colh–Colh(3D)). The mesophase structure and stability and also thermochromism were investigated as a function of the number and distribution of decyloxy and decylsulfanyl substituents in the molecule. Thermal analysis demonstrated that the presence of the 3,4,5-tri(decyloxy)phenyl substituent in the C(3) position increases the phase stability. Spectroscopic analysis showed that only all-decyloxy derivative 1[10]b exhibits a hypsochromic shift upon Colh(o) formation, while all other compounds in the series show a modest bathochromic shift in the columnar phase relative to the isotropic phase. Magnetization investigation of 1[10]d demonstrated the paramagnetic behavior of isolated spins in isotropic and columnar phases. Negligible photocurrent was detected for 1[10]d in the columnar phase.;
  This work was supported by NSF grants (CHEM-1214104). We thank Prof. Andrzej Twardowski for funding SQUID measurements
• Object availability:
  free access
• Rights:
  Uznanie autorstwa 3.0 Polska;
  http://creativecommons.org/licenses/by/3.0/pl
• Date:
  2016.03.31;
  2013
• Type:
  Article
• Language:
  English
• Format:
  application/pdf
• Publisher:
  The Royal Society of Chemistry
• Relation:
  Journal of Materials Chemistry C;2
• Identifier: http://hdl.handle.net/11089/17591 ;
  10.1039/C3TC31984A
• Data provider:
  Repozytorium Uniwersytetu Łódzkiego
• Can I use it?:
  check license
• Type:
  image