Abstract
The comparative stability of ionic liquids containing alkyl-substituted imidazolium and phosphonium cations on exposure to gamma radiation (60Co source) under the same conditions has been studied for the first time. It has been shown that when exposed to 60Co gamma radiation (an absorbed dose of up to 550 kGy) in the presence of air oxygen, phosphonium and imidazolium ionic liquids exhibit high radiolytic stability. Under these conditions, the yield of radiolytic products is no more than 1 wt %. At the same time, in contrast to phosphonium ionic liquids, imidazolium ionic liquids undergo radiolytic staining at absorbed doses in the range studied. Based on IR, UV, and 1H NMR spectroscopy and known literature data, an assumption has been made about the most probable mechanisms of transformation of imidazolium cations of an ionic liquid under the influence of gamma radiation.
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ACKNOWLEDGMENTS
We are grateful to the staff of the All-Russian Research Institute of Physical, Technical and Radio Engineering Measurements (VNIIFTRI) for the opportunity to use the MRKh-γ-100 setup and to the chief researcher of the Shared Facility Center of the Mendeleev University of Chemical Technology of Russia V.A. Polyakov for the work and provision of analytical data.
Funding
The work was supported by Mendeleev University of Chemical Technology of Russia (project no. 2020‑040).
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Translated by G. Kirakosyan
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Tarasova, N.P., Zanin, A.A. & Krivoborodov, E.G. Transformations of Imidazolium Ionic Liquids under the Influence of 60Co Gamma Radiation. Dokl Phys Chem 503, 39–44 (2022). https://doi.org/10.1134/S0012501622040017
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DOI: https://doi.org/10.1134/S0012501622040017