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Open AccessArticle

NMR Spectroscopic Study of Orientational Order in Imidazolium-Based Ionic Liquid Crystals

1
Department of Chemistry, KTH Royal Institute of Technology, 11428 Stockholm, Sweden
2
Laboratory of Biomolecular NMR, Saint Petersburg State University, Saint Petersburg 199034, Russia
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(10), 495; https://doi.org/10.3390/cryst9100495
Received: 11 September 2019 / Revised: 21 September 2019 / Accepted: 21 September 2019 / Published: 25 September 2019
(This article belongs to the Special Issue Nuclear Magnetic Resonance of Liquid Crystals)
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 13C-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. View Full-Text
Keywords: ionic liquids; liquid crystals; ionic liquid crystals; molecular orientational order; nuclear magnetic resonance ionic liquids; liquid crystals; ionic liquid crystals; molecular orientational order; nuclear magnetic resonance
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MDPI and ACS Style

Dai, J.; Majhi, D.; Kharkov, B.B.; Dvinskikh, S.V. NMR Spectroscopic Study of Orientational Order in Imidazolium-Based Ionic Liquid Crystals. Crystals 2019, 9, 495.

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