Mesophase behaviour of binary mixtures of bent-core and calamitic compounds

M. Cvetinov, D. Obadović, M. Stojanović, D. Lazar, A. Vajda, N. Éber, K. Fodor-Csorba, I. Ristić

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The mesophase behaviour of binary mixtures of bent-core and calamitic liquid crystals is presented. The nematogenic 4,6-dichloro-1,3-phenylene bis[4′-(10-undecen-1-yloxy)-1,1′-biphenyl-4-carboxylate] (I) was the banana-shaped component. As the calamitic compound ethyl 4′-(9-decen-1-yloxy)-1,1′-biphenyl-4-carboxylate (II), similar to one arm of the bent-core molecule, was used which exhibits smectic phases in a wide temperature range. A total of six mixtures with different compositions were prepared and studied by polarising optical microscopy, differential scanning calorimetry and X-ray diffraction on non-oriented samples. In the mixtures, a nematic phase is not concomitant with smectic A phase, and the temperature range of both phases highly depends on the concentration of the comprising compounds. Lowered melting temperatures have been observed for all mixtures with respect to that of the pure compounds. Unforeseen finding is the induction of a monotropic SmC phase in mixtures with lowest concentration of the bent-core compound. Semi-empirical quantum-chemical calculations have also been performed. Based on the calculated molecular conformation, as well as on collected X-ray diffraction data, a model for a possible self-assembly of the banana-shaped and calamitic compounds is proposed.

Original languageEnglish
Pages (from-to)1512-1519
Number of pages8
JournalLiquid Crystals
Volume40
Issue number11
DOIs
Publication statusPublished - Nov 1 2013

Keywords

  • X-ray diffraction
  • bent-core (banana-shaped) compounds
  • molecular parameters
  • phase transition

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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  • Cite this

    Cvetinov, M., Obadović, D., Stojanović, M., Lazar, D., Vajda, A., Éber, N., Fodor-Csorba, K., & Ristić, I. (2013). Mesophase behaviour of binary mixtures of bent-core and calamitic compounds. Liquid Crystals, 40(11), 1512-1519. https://doi.org/10.1080/02678292.2013.822938