Pyrrolidinium Ionic Liquid Crystals with Pendant Mesogenic Groups

K. Goossens, K. Lava, Peter Nockemann, K. Van Hecke, L. Van Meervelt, P. Pattison, K. Binnemans, T. Cardinaels

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


New ionic liquid crystals (including ionic metallomesogens) based oil the pyrrolidinium core are presented. N-Methylpyrrolidine was quaternized with different mesogenic groups connected to a flexible, omega-bromosubstituted alkyl spacer. The length of the flexible alkyl spacer between the cationic head group and the rigid mesogenic group was varied. The substituted pyrrolidinium cations were combined with bromide, bis(trifluoromethylsulfonyl)imide, tetrakis (2-thenoyltrifluoroacetonato)europate(III), and tetrabromouranyl anions. The influence of the type of mesogenic unit, the lengths of the flexible spacer and terminal alkyl chain, the size of the mesogenic group, and the type of anion oil the thermotropic mesomorphic behavior was investigated. Furthermore, the phase behavior was thoroughly compared with the previously reported mesomorphism of N-alkyl-N-methylpyrrolidinium salts. Low-ordered smectic A phases of the de Vries type, smectic C phases, higher-ordered smectic F/I phases, as well its crystal smectic phases (E and G, J, H, or K) were observed and investigated by polarizing optical microscopy, differential scanning calorimetry, and powder X-ray diffraction.
Original languageEnglish
Pages (from-to)5881-5897
Number of pages17
Issue number10
Publication statusPublished - 19 May 2009

ASJC Scopus subject areas

  • Electrochemistry
  • Spectroscopy
  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces


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