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The proton bound association of large multifunctional group molecules: Tartaric acid esters

Authors

  • J. P. Honovich,

    1. Institute of Energy Problems of Chemical Physics, Russian Academy of Sciences, 38 Leninsky Prospect, Bldg. 2, Moscow, Russia
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    • USA/Russia NAS Visiting Exchange Scientist.

  • G. V. Karachevtsev,

    1. Institute of Energy Problems of Chemical Physics, Russian Academy of Sciences, 38 Leninsky Prospect, Bldg. 2, Moscow, Russia
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    • Joint tenure Moscow Institute of Physics and Technology.

  • E. N. Nikolaev

    Corresponding author
    1. Institute of Energy Problems of Chemical Physics, Russian Academy of Sciences, 38 Leninsky Prospect, Bldg. 2, Moscow, Russia
    • Institute of Energy Problems of Chemical Physics, Russian Academy of Sciences, 38 Leninsky Prospect, Bldg. 2, Moscow, Russia
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Abstract

The kinetics fo production of proton-bound dimers of dimethyl- and diisopropyl-tartrate were analyzed were analyzed by the method of initial slopes. From the pressure dependence of the apparent bimolecular rate constatn, the back-dissociation rate and radiative stabilization of the intermediate excited collision complex was calculated. The back-dissociation (10.3 and 2.8 × 10 3s−1) and radiative (8.2 and 7.1 s−1) rates are compared to literature values for functionally similar acetone. In contrast to acetone these dimers exhibit a back-dissociation reaction to regenerate the monomer species. These results can be taken to imply a lower binding energy in these dimers due to steric effects. Competing reactions to form ions of m/z 145 and 235 were also observed for the dimethyl and diisopropyl ester, respectively.

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