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NMR Spectroscopic Study of Orientational Order in Imidazolium-Based Ionic Liquid Crystals
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0002-9570-4187
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry.
St Petersburg State Univ, Lab Biomol NMR, St Petersburg 199034, Russia..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry. St Petersburg 199034, Russia..ORCID iD: 0000-0002-6524-1441
2019 (English)In: Crystals, ISSN 2073-4352, Vol. 9, no 10, article id 495Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 9, no 10, article id 495
Keywords [en]
ionic liquids, liquid crystals, ionic liquid crystals, molecular orientational order, nuclear magnetic resonance
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-265449DOI: 10.3390/cryst9100495ISI: 000498263500010Scopus ID: 2-s2.0-85073439153OAI: oai:DiVA.org:kth-265449DiVA, id: diva2:1379581
Note

QC 20191217

Available from: 2019-12-17 Created: 2019-12-17 Last updated: 2019-12-17Bibliographically approved

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Dai, JingMajhi, Debashis

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