NMR spectroscopic study of orientational order in imidazolium-based ionic liquid crystals

Jing Dai, Debashis Majhi, Boris B. Kharkov, Sergey V. Dvinskikh

Research output

Abstract

We report on molecular and local orientational order of a series of imidazolium-based ionic liquid crystals exhibiting layered smectic A mesophase. Materials constituting of 1-dodecyl-3-methylimidazolium cation, and different counter-ions, were investigated. We apply two-dimensional13C-1H dipolar NMR spectroscopy to quantify orientational order of C-H bonds of the organic cation. The experimental data supported the structural model of the interdigitated chains aligned with the smectic layer normal. Molecular order parameter S was found to increase in the anion sequence BF4 < I < Br < Cl. This trend correlates well with ionic radius, negative charge delocalization, and hydrogen-bonding properties of the anions.

Original languageEnglish
Article number495
JournalCrystals
Volume9
Issue number10
Early online date25 Sep 2019
DOIs
Publication statusPublished - Oct 2019

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Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

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