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Determination of the fragmentation mechanisms of organophosphorus ions by H 2 O and D 2 O atmospheric‐pressure ionization tandem mass spectrometry
Author(s) -
Snyder A. Peter,
Harden Charles S.
Publication year - 1990
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210250112
Subject(s) - chemistry , mass spectrometry , ion , formaldehyde , tandem mass spectrometry , protonation , polyatomic ion , mass spectrum , chemical ionization , trimethylamine , fragmentation (computing) , collision induced dissociation , photochemistry , ionization , organic chemistry , chromatography , computer science , operating system
Dimethylmethyl phosphonate (DMMP), dimethyl phosphite (DMPI), trimethyl phosphite (TMPI) and trimethyl phosphate (TMP) were investigated using H 2 O and D 2 O atmospheric‐pressure ionization (API) tandem mass Spectrometry. All daughter ions could be explained by losses of one or a successive number of stable molecules as opposed to losses of radicals such as the hydride, methyl and methoxy species. Losses of neutral methanol and dimethyl ether and of protonated methanol and formaldehyde ions from all four organophosphorus pseudo‐molecular ions were observed. The DMMP and DMPI MH + pseudomolecular ions produced the losses of neutral C 2 H 6 and water, respectively. Formaldehyde loss was not observed for the MH + ions, but it was well represented in the decomposition pathways of daughter ions. The D 2 O reagent gas highlighted the role of the ionizing proton/ deuteron in the various daughter ions, including m/z 95, 79, 65, 49, 33, 31 and 47. The last ion was found to be isobaric in that m/z 47 and 48 both appeared with similar abundances in the D 2 O‐API daughter ion mass spectra of TMPI and TMP.