Positive-ion, methane-mediated chemical ionization mass spectra were measured for simple bifunctional aromatic compounds of the type m-XCH,C,H,CH,Y, where X = NH, and N(CH,),, and Y = OH and OCH,. Essentially only three peaks of ions, I MH] +, [ MH -XH 1 + and [ MH -YH I +, have appeared for each co
Protonation susceptibility of functional groups: A new parameter for interpreting chemical ionization mass spectra of bifunctional organic compounds
โ Scribed by Hisao Nakata
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 277 KB
- Volume
- 27
- Category
- Article
- ISSN
- 1076-5174
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โฆ Synopsis
A new parameter, the protonation susceptibility (PS), of functional groups in the cbemkal ionization mass spectrometry of bifunctional organic compounds k presented. In terms of quaskquilibrium tbeory of unimolecular decompositioa of the molecular protonated ion of [ MHI +, the relative PS corresponds to the relative area under P(E) curves of IMHI* ious that have a proton at different functional groups Numerical evaluation of tbe PS values of pertinent functiwpl groups was made by using particularly selected compounds The results clearly indicate that PS is hiependent of proton affinity (PA).
๐ SIMILAR VOLUMES
Chemical ionization (CI) and fast atom bombardment (FAB) mass spectra of simple bifunctional aromatic compounds were compared. Some significant differences were revealed with respect to the site of protonation and extent of fragmentations. Unlike conventional CI ionization, the protonated molecule f