Synthesis and liquid crystal properties of phthalocyanine bearing a star polytetrahydrofuran moiety


Gursel Y. H. , Şenkal B. F. , Kandaz M., Yakuphanoglu F.

POLYHEDRON, vol.28, no.8, pp.1490-1496, 2009 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 28 Issue: 8
  • Publication Date: 2009
  • Doi Number: 10.1016/j.poly.2009.02.038
  • Title of Journal : POLYHEDRON
  • Page Numbers: pp.1490-1496

Abstract

A new polymeric ligand, 6-(3,4-dicyanophenylthio)-hexyl-2-polytetrahydrofuranacetate (2) and its liquid crystalline polymeric phthalocyanine, 2,9,16,23-tetrakis-{6-(polytetrahydrofuran-2-carboxylate)hexylthio-phthalocyaninatocobalt(II) (3), {Co[Pc(S-C6H13OCO-poly-THF)(4)]}(CoPcLC) have been synthesized. The ligand and the phthalocyanine, bearing polytetrahydrofuran moieties (poly-THF), were characterized using elemental analysis, FTIR, H-1 and C-13 NMR, and UV-Vis techniques. CoPcLC (3) promotes a greater interaction between the mesogens, resulting in solution aggregations together with a red-shift in the Q-band in the presence of the soft Ag+ ion. The dielectric anisotropy and phase transition temperature values of CoPcLC doped with 4-cyano-4'-n-pentylbiphenyl (5CB) were found to be 7.17 and 40.5 degrees C, respectively. The dielectrical anisotropy behaviour of the liquid crystals changes from the positive to the negative type. The current-voltage characteristics of the liquid crystals show a non-linear behaviour. (C) 2009 Elsevier Ltd. All rights reserved.