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- W4296687331 endingPage "110513" @default.
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- W4296687331 abstract "Long-lived radicals were observed in irradiated room temperature ionic liquids (RTILs) composed of the bis(trifluoromethylsulfonyl)imide anion (Tf2N−) with 1-hexyl-3-methylimidazolium (hmim+) and1-butyl-3-methylimidazolium (bmim+) cations. The EPR signal intensity increases within hours and the spectral pattern changes during the time after irradiation. The kinetics data obtained indicate the existence of at least two distinct radical cations that have different formation and decay rates. We demonstrate that oxygen does not react rapidly with the radical species formed. The bmim + Tf2N− was selectively deuterated at various positions which allowed us to suggest possible structures of the stable radicals formed. The first structure is a radical cation containing 2 nitrogens and 6 protons all with ca. 8.2 Gauss hyperfine splittings, and 2 protons with 2.8 Gauss splitting. The structure of the second radical cation is similar, but characterized by an odd number of hydrogens with ca. 8.2 Gauss splitting. Extensive quantum chemistry calculations were performed to attempt to identify the structure of these persistent radicals. The most likely candidates are imidazole radical cations having methyl groups at the nitrogen atoms and substituents in the second position of the imidazole ring." @default.
- W4296687331 created "2022-09-23" @default.
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- W4296687331 date "2023-01-01" @default.
- W4296687331 modified "2023-09-27" @default.
- W4296687331 title "Persistent radicals in irradiated imidazolium ionic liquids probed by EPR spectroscopy" @default.
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- W4296687331 doi "https://doi.org/10.1016/j.radphyschem.2022.110513" @default.
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