کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9746656 | 1492401 | 2005 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Fragmentations and reactions of some isotopically labelled dimethyl methyl phosphono and trimethyl phosphoro thiolates and thionates studied by electrospray ionisation ion trap mass spectrometry
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Fragmentations and reactions of some isotopically labelled dimethyl methyl phosphono and trimethyl phosphoro thiolates and thionates studied by electrospray ionisation ion trap mass spectrometry Fragmentations and reactions of some isotopically labelled dimethyl methyl phosphono and trimethyl phosphoro thiolates and thionates studied by electrospray ionisation ion trap mass spectrometry](/preview/png/9746656.png)
چکیده انگلیسی
In this paper, studies on electrospray ionisation ion trap mass spectrometry of organophosphates are extended to a series of dimethyl methylphosphono and trimethyl phosphoro thionates and thiolates and some deuterated isotopomers. Of particular, interest is the comparison of the collision-induced fragmentation of ions from these compounds with those of the non-sulphur containing analogues reported previously. The thiono and thiolo isomeric structures of the sulphur containing ions analogous to I and II (see below) have very similar energies and undergo a ready interconversion. In the case of the phosphono compounds, the electronic structure calculations show that the methyl migration implicit in thiono-thiolo interconversion occurs directly and although methyl migration from P to the phosphonyl O or phosphonothionyl S can occur, the transition state (TS) energies are somewhat higher and, in the case of the migration to O, too high to take part in any of the subsequent collision induced fragmentations. With one exception, the mechanisms proposed for some of these fragmentations are supported by electronic structure calculations at the DFT-B3LYP level.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Mass Spectrometry - Volume 244, Issue 1, 15 June 2005, Pages 29-40
Journal: International Journal of Mass Spectrometry - Volume 244, Issue 1, 15 June 2005, Pages 29-40
نویسندگان
J.D. Barr, A.J. Bell, F. Ferrante, G. La Manna, J.L. Mundy, C.M. Timperley, M.J. Waters, P. Watts,