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.
Research on Chemical Intermediates – Springer Journals
Published: Jun 9, 2009
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