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Dynamic Properties of Imidazolium Orthoborate Ionic Liquids Mixed with Polyethylene Glycol Studied by NMR Diffusometry and Impedance Spectroscopy
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0002-6810-1882
Institute of Physics, Kazan Federal University, Kazan, Russia.
Institute of Physics, Kazan Federal University, Kazan, Russia.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0002-6295-4112
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2017 (English)In: Magnetic Resonance in Chemistry, ISSN 0749-1581, E-ISSN 1097-458XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

We used 1H pulsed field gradient (PFG) NMR to study the self-diffusion of polyethylene glycol (PEG) with average molecular mass of 200 and ions in mixtures of PEG with imidazolium bis(mandelato)borate (BMB) and imidazolium bis(oxalato)borate (BOB) ionic liquids (ILs). The ionic liquid was mixed with PEG in the concentration range of 0–100 wt%. Within the temperature range of 295 to 353 K, the diffusion coefficient of BMB is slower than that of the imidazolium cation. The diffusion coefficients of PEG, as well as the imidazolium cation and BMB anions, differ under all experimental conditions tested. This demonstrates that the IL in the mixture is present in at least a partially dissociated state. Generally, increasing the concentration of PEG leads to an increase in the diffusion coefficients of PEG and both the ions, and decreases their activation energy for diffusion. NMR chemical shift alteration analysis showed that the presence of PEG changes the chemical shifts of both ions but in different directions. Impedance spectroscopy was used to measure the ionic conductivity of the ionic liquids mixed with PEG.

Place, publisher, year, edition, pages
John Wiley & Sons, 2017.
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Chemical Sciences
Research subject
Chemistry of Interfaces
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URN: urn:nbn:se:ltu:diva-64929DOI: 10.1002/mrc.4636PubMedID: 28752526OAI: oai:DiVA.org:ltu-64929DiVA: diva2:1129064
Available from: 2017-07-31 Created: 2017-07-31 Last updated: 2017-08-16

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Filippov, AndreiBhattacharyya, ShubhankarAntzutkin, Oleg N.Shah, Faiz Ullah
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