Radical ionic liquid: An efficient self-probe to study heterogeneous structure in glassy state using EPR spectroscopy

[Display omitted] •Paramagnetic ionic liquid is synthesized and used as a spin probe for EPR spectroscopy.•IL bearing stable radical acts as a self-probe to study molecular-level interactions in bulk non–magnetic IL.•Unusual structural anomalies near the glass transition were confirmed by their obse...

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Bibliographic Details
Published in:Journal of molecular liquids 2023-07, Vol.381, p.121830, Article 121830
Main Authors: Yu. Ivanov, Mikhail, Bakulina, Olga D., Polienko, Yuliya F., Kirilyuk, Igor A., Prikhod'ko, Sergey A., Yu. Adonin, Nicolay, Fedin, Matvey V.
Format: Article
Language:English
Subjects:
EPR
Glasses
Ionic liquids
Nanostructuring
Spin probes
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Summary:[Display omitted] •Paramagnetic ionic liquid is synthesized and used as a spin probe for EPR spectroscopy.•IL bearing stable radical acts as a self-probe to study molecular-level interactions in bulk non–magnetic IL.•Unusual structural anomalies near the glass transition were confirmed by their observation using radical IL.•Radical IL probes constitute a versatile tool to study nanostructuring in ILs using EPR. Ionic liquids (ILs) exhibit a number of unique properties, including formation of various heterogeneities in their liquid and glassy states. Electron Paramagnetic Resonance (EPR) spectroscopy has proven informative in studies of such heterogeneous nanostructures; however it employs additional small paramagnetic molecules – spin probes – dissolved in ILs as reporters. In this work we synthesized two radical-ILs, which include integrated paramagnetic fragments in their structures, and employed them in continuous wave (CW) and pulse EPR studies of structural peculiarities in IL glasses. In this approach no external-to-IL spin probe is required. We have shown that the trends observed with radical-ILs are similar to those obtained previously using external-to-IL spin probes. In particular, unusual structural anomalies near glass transition temperatures, which were previously found using external-to-IL spin probes, have been now observed using radical-ILs, thus confirming their genuine origin. In general, radical-ILs can be considered as efficient tools to study heterogeneous structure of ILs using EPR.
ISSN:0167-7322
1873-3166
DOI:10.1016/j.molliq.2023.121830