Journal
CRYSTALS
Volume 9, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/cryst9100495
Keywords
ionic liquids; liquid crystals; ionic liquid crystals; molecular orientational order; nuclear magnetic resonance
Funding
- Swedish Research Council VR
- Russian Foundation for Basic Research [17-03-00057]
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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-dimensional C-13-H-1 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.
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