Peek Inside the Water Mixtures of Ionic Liquids at Molecular Level: Microscopic Properties Probed by EPR Spectroscopy
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N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry
of Siberian Branch of Russian Academy of Sciences

The article with participation of NIOCh's researchers is published in International Journal of Molecular Sciences   (IF=5,923


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

Mikhail Yu. Ivanov,Yuliya F. Polienko ,Igor A. Kirilyuk ,Sergey A. Prikhod’ko ,Nicolay Yu. Adonin  and Matvey V. Fedin

Int. J. Mol. Sci. 2021, 22(21), 11900
Publication Date: November 2, 2021


 https://doi.org/10.3390/ijms222111900

(This article belongs to the Special Issue Advanced Research in Green Chemistry)

ijms 22 11900 ag 550

Abstract

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]BF4 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. View Full-Text

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