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Formation of p-terphenyl excited states in the ionic liquid methyltributylammonium bis[(trifluoromethyl)sulfonyl]imide: pulse radiolysis study

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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 C6H5COC6H •6 , 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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  1. Department of Radiation Chemistry and Technology, Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195, Warsaw, Poland

    Jan Grodkowski, Rafał Kocia & Jacek Mirkowski

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  1. Jan Grodkowski
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  2. Rafał Kocia
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  3. Jacek Mirkowski
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Correspondence to Jan Grodkowski.

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Grodkowski, J., Kocia, R. & Mirkowski, J. Formation of p-terphenyl excited states in the ionic liquid methyltributylammonium bis[(trifluoromethyl)sulfonyl]imide: pulse radiolysis study. Res Chem Intermed 35, 411–419 (2009). https://doi.org/10.1007/s11164-009-0056-2

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