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Crystals 2019, 9(1), 18; https://doi.org/10.3390/cryst9010018

Molecular and Segmental Orientational Order in a Smectic Mesophase of a Thermotropic Ionic Liquid Crystal

1
Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden
2
Laboratory of Biomolecular NMR, Saint Petersburg State University, Saint Petersburg 199034, Russia
*
Author to whom correspondence should be addressed.
Received: 30 November 2018 / Revised: 20 December 2018 / Accepted: 24 December 2018 / Published: 28 December 2018
(This article belongs to the Special Issue Ionic Liquid Crystals)
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Abstract

We investigate conformational dynamics in the smectic A phase formed by the mesogenic ionic liquid 1-tetradecyl-3-methylimidazolium nitrate. Solid-state high-resolution 13C nuclear magnetic resonance (NMR) spectra are recorded in the sample with the mesophase director aligned in the magnetic field of the NMR spectrometer. The applied NMR method, proton encoded local field spectroscopy, delivers heteronuclear dipolar couplings of each 13C spin to its 1H neighbours. From the analysis of the dipolar couplings, orientational order parameters of the C–H bonds along the hydrocarbon chain were determined. The estimated value of the molecular order parameter S is significantly lower compared to that in smectic phases of conventional non-ionic liquid crystals. 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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Dai, J.; Kharkov, B.B.; Dvinskikh, S.V. Molecular and Segmental Orientational Order in a Smectic Mesophase of a Thermotropic Ionic Liquid Crystal. Crystals 2019, 9, 18.

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