Gas-Phase Reactions of Bare and Ligated Uranium Ions with Sulfur Hexafluoride
| العنوان: | Gas-Phase Reactions of Bare and Ligated Uranium Ions with Sulfur Hexafluoride |
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| المؤلفون: | John K. Gibson, Glen P. Jackson, Douglas C. Duckworth |
| المصدر: | The Journal of Physical Chemistry A. 108:1042-1051 |
| بيانات النشر: | American Chemical Society (ACS), 2004. |
| سنة النشر: | 2004 |
| مصطلحات موضوعية: | Chemical kinetics, Sulfur hexafluoride, Reaction rate, chemistry.chemical_compound, chemistry, Reaction model, Analytical chemistry, chemistry.chemical_element, Physical and Theoretical Chemistry, Uranium, Dissociation (chemistry), Ion, Gas phase |
| الوصف: | Reactions of bare and ligated uranium ions with sulfur hexafluoride were studied in a quadrupole ion trap mass spectrometer. Bare U{sup +} was found to react rather efficiently with SF{sub 6} (k/k{sub ADO} {approx} 0.4) to produce both UF{sub n}{sup +} (n = 1, 2, 3, 4) and SF{sub n}{sup +} (n = 1, 2, 3). Whereas the UF{sup +}/SF{sub 6} reaction rate was essentially the same as that for U{sup +}/SF{sub 6}, both UF{sub 2}{sup +} and UF{sub 3}{sup +} were inert; this is attributed to a repulsive interaction between UF{sub n}{sup +} and SF{sub 6} when n exceeds 1. Reactions of UF{sup +} (k/k{sub ADO} {approx} 0.2) and UF{sub 2}{sup +} (k/k{sub ADO} {approx} 0.05) with H{sub 2}O resulted in both F {yields} OH exchange and oxidation. In contrast, UF{sub 3}{sup +} reacted very efficiently with H{sub 2}O (k/k{sub ADO} {approx} 1), exhibiting only F {yields} OH exchange. The primary ion products of the UO{sup +}/SF{sub 6} reaction (k/k{sub ADO} {approx} 0.2) were SF{sub 3}{sup +} and UOF{sub 2}{sup +}; those of the UOH{sup +}/SF{sub 6} reaction (k/k{sub ADO} {approx} 0.3) were SF{sub 3}{sup +} and UOF{sup +}. The reaction results are discussed in the context of amore » previously proposed reaction model, the distinctive chemistry of uranium, and thermodynamic considerations. The results illuminate the nature of uranium as well as general aspects of the interaction of bare and ligated transition-metal ions with SF{sub 6}. Results for collision-induced dissociation (CID) of selected uranium molecular ions support the concept of CID being a quasithermal process under these experimental conditions, with rearrangements prior to fragmentation possible for certain ions.« less |
| تدمد: | 1520-5215 1089-5639 |
| DOI: | 10.1021/jp037175q |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::4dfaec9e713d6edfb509e5e7e0d765a7 https://doi.org/10.1021/jp037175q |
| رقم الانضمام: | edsair.doi...........4dfaec9e713d6edfb509e5e7e0d765a7 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15205215 10895639 |
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| DOI: | 10.1021/jp037175q |