Imidazolium ionic liquid crystals with pendant mesogenic groups

K. Goossens, Peter Nockemann, K. Driesen, B. Goderis, C. Gorller-Walrand, K. Van Hecke, L. Van Meervelt, E. Pouzet, K. Binnemans, T. Cardinaels

Research output: Contribution to journalArticlepeer-review

131 Citations (Scopus)

Abstract

Ionic liquid crystals were obtained by coupling one or two mesogenic units (cholesterol or cyanobiphenyl) to an imidazolium cation. Anions are bromide, bis(trifluoromethylsulfonyl)imide, and tetrakis(2-thenoyltrifluoroacetonato)europate(III). The mesomorphism of the compounds depends on the type and number of mesogenic units and on the type of anion. In general, the most stable mesophases are observed for the bis(trifluoromethylsulfonyl)imide salts. Most of the compounds containing cholesterol moieties show enantiotropic SmA* phases over a broad temperature range, and some of them are room temperature liquid crystals. Modeling of the small-angle X-ray scattering patterns revealed the molecular arrangement in these mesophases. On the contrary, most of the compounds containing cyanobiphenyl groups exhibit monotropic lamellar or nematic mesophases, depending on the number of mesogenic units. The imidazolium salts containing the tetrakis(2-thenoyltrifluoroacetonato)europate(III) anion show an intense red photoluminescence.
Original languageEnglish
Pages (from-to)157-168
Number of pages12
JournalChemistry of Materials
Volume20
Issue number1
DOIs
Publication statusPublished - 08 Jan 2008

ASJC Scopus subject areas

  • Materials Science(all)
  • Materials Chemistry

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