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Pulse radiolysis study of the reactions of hydrogen atoms in the ionic liquid methyltributylammonium bis[(trifluoromethyl)sulfonyl]imide

Journal of Physical Chemistry A, ISSN: 1089-5639, Vol: 107, Issue: 46, Page: 9794-9799
2003
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  • Citations
    91
    • Citation Indexes
      91
  • Captures
    21

Article Description

Reactions of hydrogen atoms with pyrene, phenanthrene, benzophenone, 2-propanol, and crotonic acid in the ionic liquid methyltributylammonium bis[(trifluoromethyl)sulfonyl]imide (RNNTf) were studied by pulse radiolysis. Radiolysis of the ionic liquid leads to formation of dry electrons and solvated electrons, which are scavenged by HO to produce H atoms. Hydrogen atoms react very rapidly with pyrene (3.8 × 10 L mol s) and phenanthrene (2.9 × 10 L mol s) to form H-adduct radicals with sharp absorption peaks at 405 and 395 nm, respectively. They also react with benzophenone to form ring adducts, but the reaction is much slower. By competition kinetics with pyrene, the rate constants for reactions of H atoms with 2-PrOH and with crotonic acid were estimated to be ≈6 × 10 and 4.6 × 10 L mol s, respectively. All the rate constants, except for benzophenone, are similar to the values measured or estimated for the same reactions in aqueous solutions. The reactions with the aromatic hydrocarbons must be diffusion-controlled but are faster than diffusion-controlled reactions for solvated electrons in the same ionic liquid.

Bibliographic Details

Jan Grodkowski; Pedatsur Neta; James F. Wishart

American Chemical Society (ACS)

Chemistry

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