Formation of p-terphenyl excited states in the ionic liquid methyltributylammonium bis[(trifluoromethyl)sulfonyl]imide: pulse radiolysis study |
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Authors: | Jan Grodkowski Rafał Kocia Jacek Mirkowski |
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Affiliation: | (1) Department of Radiation Chemistry and Technology, Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland |
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Abstract: | Solutions of 80 mM benzophenone (BP) and up to 14 mM p-terphenyl (TP) in the ionic liquid methyltributylammonium bis[(trifluoromethyl)sulfonyl]imide (R4NNTf2) have been investigated by nanosecond pulse radiolysis. The resulting transient absorption spectra of pulse-irradiated argon saturated solutions correspond to the formation of several intermediates derived from BP and TP: benzophenone radical anion [(C6H5)2CO]•− (BP•−) converted after ~20 μs into ketyl radicals (C6H5)2C•OH (BP•H), a hydrogen adduct to the phenyl ring of benzophenone C6H5COC6H6•, p-terphenyl triplet excited state 3TP*, and traces of TP radical ions. 3TP* was formed in two steps, the first immediately during the pulse and the second in pseudo-first order process with a second order reaction rate constant calculated from TP concentration dependence: k = ~2 × 108 dm3 mol−1 s−1. |
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Keywords: | Benzophenone p-terphenyl Nanosecond pulse radiolysis |
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