Translational energy-resolved collisionally activated methyl cation transfer from protonated methane to argon, krypton, and xenon and from protonated fluoromethane to argon and molecular oxygen
- Univ. of Amsterdam (Netherlands)
Translational energy-resolved collisionally activated gas-phase reaction of protonated methane with argon, krypton, and xenon and of protonated fluoromethane with argon and molecular oxygen are studied using the method of Fourier transform ion cyclotron resonance mass spectrometry. It appears that translationally activated protonated methane can act as a methyl cation donor if the competing proton transfer is energetically less favored. Translational energy-resolved collisionally activated reactions between protonated methane and argon, krypton, and xenon reveal that the methy cation transfers resulting at the formation of methylargonium, methylkyrptonium, and methylxenonium ions all proceed via transition states which are about 0.6 eV higher in energy than the reactants. The results suggest that in these transition states the weakening of the two-electron three-center C-H-H bond in protonated methane is more advanced than the bond formation between the methyl group and the noble gas atom. Similarly, translationally activated protonated fluoromethane can transfer a methyl cation to argon and molecular oxygen via transition states which are about 0.3 and 0.4 eV higher in energy than the reactants respectively. It is shown that the product ion from the methyl cation transfer from protonated fluoromethane to molecule oxygen has the methylperoxy cation structure. 60 refs., 9 figs., 1 tab.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 458806
- Journal Information:
- Journal of Physical Chemistry, Vol. 96, Issue 22; Other Information: PBD: 29 Oct 1992
- Country of Publication:
- United States
- Language:
- English
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