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Peek Inside the Water Mixtures of Ionic Liquids at Molecular Level: Microscopic Properties Probed by EPR Spectroscopy

Many ionic liquids (ILs) can be mixed with water, forming either true solutions or emulsions. This favors their applications in many respects, but at the same time might strongly alter their physicochemical properties. A number of methods exist for studying the macroscopic properties of such mixture...

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Autores principales: Ivanov, Mikhail Yu., Polienko, Yuliya F., Kirilyuk, Igor A., Prikhod’ko, Sergey A., Adonin, Nicolay Yu., Fedin, Matvey V.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8584414/
https://www.ncbi.nlm.nih.gov/pubmed/34769336
http://dx.doi.org/10.3390/ijms222111900
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author Ivanov, Mikhail Yu.
Polienko, Yuliya F.
Kirilyuk, Igor A.
Prikhod’ko, Sergey A.
Adonin, Nicolay Yu.
Fedin, Matvey V.
author_facet Ivanov, Mikhail Yu.
Polienko, Yuliya F.
Kirilyuk, Igor A.
Prikhod’ko, Sergey A.
Adonin, Nicolay Yu.
Fedin, Matvey V.
author_sort Ivanov, Mikhail Yu.
collection PubMed
description Many ionic liquids (ILs) can be mixed with water, forming either true solutions or emulsions. This favors their applications in many respects, but at the same time might strongly alter their physicochemical properties. A number of methods exist for studying the macroscopic properties of such mixtures, whereas understanding their characteristics at micro/nanoscale is rather challenging. In this work we investigate microscopic properties, such as viscosity and local structuring, in binary water mixtures of IL [Bmim]BF(4) in liquid and glassy states. For this sake, we use continuous wave and pulse electron paramagnetic resonance (EPR) spectroscopy with dedicated spin probes, located preferably in IL-rich domains or distributed in IL- and water-rich domains. We demonstrate that the glassy-state nanostructuring of IL-rich domains is very similar to that in neat ILs. At the same time, in liquid state the residual water makes local viscosity in IL-rich domains noticeably different compared to neat ILs, even though the overwhelming amount of water is contained in water-rich domains. These results have to be taken into account in various applications of IL-water mixtures, especially in those cases demanding the combinations of optimum micro- and macroscopic characteristics.
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spelling pubmed-85844142021-11-12 Peek Inside the Water Mixtures of Ionic Liquids at Molecular Level: Microscopic Properties Probed by EPR Spectroscopy Ivanov, Mikhail Yu. Polienko, Yuliya F. Kirilyuk, Igor A. Prikhod’ko, Sergey A. Adonin, Nicolay Yu. Fedin, Matvey V. Int J Mol Sci Article Many ionic liquids (ILs) can be mixed with water, forming either true solutions or emulsions. This favors their applications in many respects, but at the same time might strongly alter their physicochemical properties. A number of methods exist for studying the macroscopic properties of such mixtures, whereas understanding their characteristics at micro/nanoscale is rather challenging. In this work we investigate microscopic properties, such as viscosity and local structuring, in binary water mixtures of IL [Bmim]BF(4) in liquid and glassy states. For this sake, we use continuous wave and pulse electron paramagnetic resonance (EPR) spectroscopy with dedicated spin probes, located preferably in IL-rich domains or distributed in IL- and water-rich domains. We demonstrate that the glassy-state nanostructuring of IL-rich domains is very similar to that in neat ILs. At the same time, in liquid state the residual water makes local viscosity in IL-rich domains noticeably different compared to neat ILs, even though the overwhelming amount of water is contained in water-rich domains. These results have to be taken into account in various applications of IL-water mixtures, especially in those cases demanding the combinations of optimum micro- and macroscopic characteristics. MDPI 2021-11-02 /pmc/articles/PMC8584414/ /pubmed/34769336 http://dx.doi.org/10.3390/ijms222111900 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ivanov, Mikhail Yu.
Polienko, Yuliya F.
Kirilyuk, Igor A.
Prikhod’ko, Sergey A.
Adonin, Nicolay Yu.
Fedin, Matvey V.
Peek Inside the Water Mixtures of Ionic Liquids at Molecular Level: Microscopic Properties Probed by EPR Spectroscopy
title Peek Inside the Water Mixtures of Ionic Liquids at Molecular Level: Microscopic Properties Probed by EPR Spectroscopy
title_full Peek Inside the Water Mixtures of Ionic Liquids at Molecular Level: Microscopic Properties Probed by EPR Spectroscopy
title_fullStr Peek Inside the Water Mixtures of Ionic Liquids at Molecular Level: Microscopic Properties Probed by EPR Spectroscopy
title_full_unstemmed Peek Inside the Water Mixtures of Ionic Liquids at Molecular Level: Microscopic Properties Probed by EPR Spectroscopy
title_short Peek Inside the Water Mixtures of Ionic Liquids at Molecular Level: Microscopic Properties Probed by EPR Spectroscopy
title_sort peek inside the water mixtures of ionic liquids at molecular level: microscopic properties probed by epr spectroscopy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8584414/
https://www.ncbi.nlm.nih.gov/pubmed/34769336
http://dx.doi.org/10.3390/ijms222111900
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