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Protonation susceptibility of functional groups: A new parameter for interpreting chemical ionization mass spectra of bifunctional organic compounds

โœ 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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โœฆ 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).


๐Ÿ“œ SIMILAR VOLUMES


Protonation susceptibility and fragmenta
โœ Hisao Nakata; Kenji Kadoguchi; Hideyuki Konishi; Naohito Takeda; Akira Tatematsu ๐Ÿ“‚ Article ๐Ÿ“… 1993 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 320 KB

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

Significant differences in site of proto
โœ Hisao Nakata; Naofumi Arakawa; Rika Mizuno ๐Ÿ“‚ Article ๐Ÿ“… 1994 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 451 KB

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