کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5418733 | 1506968 | 2007 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Can the CH2BH2 and CH3BH radicals, cations and anions be observed by experiment?
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The structure, thermochemistry, isomerization and dissociation of the CH2BH2 and CH3BH radicals, cations and anions have been explored with a wide range of ab initio levels of computational theory and their formation has been probed by tandem mass spectrometry and RRKM kinetic theory. Calculations predict that CH2BH2â+ is not an equilibrium structure on the potential energy surface. The CH3BHâ+ was characterized by its collision-induced dissociation mass spectrum and neutralization-reionization (NR) mass spectrometry was used to generate the CH3BHâ
- radical. While both CH2BH2â
- and CH3BHâ
- are stable with respect to isomerization and dissociation, a relatively low barrier to the 1,2-hydrogen shift means that pure CH3BHâ
- can only be made cold, and so the above NR experiment likely produces a mixture of neutrals, of which only CH3BHâ
- can be reionized. Vertical electron attachment to CH3BHâ
- is endothermic which means the CH3BHâ- anion is unlikely to be made from the cation or radical. In addition, the anion lies in a shallow well of only 48Â kJÂ molâ1 and will undergo fast isomerization to CH2BH2â- below the dissociation limit.
- radical. While both CH2BH2â
- and CH3BHâ
- are stable with respect to isomerization and dissociation, a relatively low barrier to the 1,2-hydrogen shift means that pure CH3BHâ
- can only be made cold, and so the above NR experiment likely produces a mixture of neutrals, of which only CH3BHâ
- can be reionized. Vertical electron attachment to CH3BHâ
- is endothermic which means the CH3BHâ- anion is unlikely to be made from the cation or radical. In addition, the anion lies in a shallow well of only 48Â kJÂ molâ1 and will undergo fast isomerization to CH2BH2â- below the dissociation limit.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure: THEOCHEM - Volume 811, Issues 1â3, 1 June 2007, Pages 303-312
Journal: Journal of Molecular Structure: THEOCHEM - Volume 811, Issues 1â3, 1 June 2007, Pages 303-312
نویسندگان
Lisa D. Walrond, Paul M. Mayer,