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Molecular and Segmental Orientational Order in a Smectic Mesophase of a Thermotropic Ionic Liquid Crystal
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry.
St Petersburg State Univ, Lab Biomol NMR, St Petersburg 199034, Russia..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry.
2019 (English)In: Crystals, ISSN 2073-4352, Vol. 9, no 1, article id 18Article in journal (Refereed) Published
Abstract [en]

We investigate conformational dynamics in the smectic A phase formed by the mesogenic ionic liquid 1-tetradecyl-3-methylimidazolium nitrate. Solid-state high-resolution C-13 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 C-13 spin to its H-1 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.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 9, no 1, article id 18
Keywords [en]
ionic liquids, liquid crystals, ionic liquid crystals, molecular orientational order, nuclear magnetic resonance
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URN: urn:nbn:se:kth:diva-245954DOI: 10.3390/cryst9010018ISI: 000458578100018Scopus ID: 2-s2.0-85059389920OAI: oai:DiVA.org:kth-245954DiVA, id: diva2:1295185
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QC 20190311

Available from: 2019-03-11 Created: 2019-03-11 Last updated: 2019-03-11Bibliographically approved

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Dai, Jing

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