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Mass spectrometric investigation on some pyrilium salts by different. Ionization methods and metastable ion studies
Author(s) -
Hadjieva P.,
Deligeorgiev T.,
Fontana S.,
Catinella S.,
Traldi P.
Publication year - 1994
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290080207
Subject(s) - chemistry , ion , fragmentation (computing) , electron ionization , fast atom bombardment , ionization , metastability , mass spectrometry , perchloric acid , chemical ionization , mass spectrum , analytical chemistry (journal) , thermal ionization , field desorption , inorganic chemistry , chromatography , organic chemistry , computer science , operating system
A series of pyrilium hydrochlorides (Py + ClO − 4 ) have been studied by means of both electron ionization and fast‐atom bombardment (FAB) methods. Only for some compounds does electron ionization show the formation of Py + , together with [Py—H] +· ions. Metastable ion data indicate that the former also originate through H · loss when their formation could be explained by loss of perchloric acid through a thermal process directly from the salt. Many fragment ions, related to the original structures, are also detected. In contrast, in FAB conditions, all the compounds show the formation of Py + without any fragmentation products, proving its effectiveness in the easy identification of the related molecular species. Only by the mass‐analyzed ion kinetic energy spectra of Py + ions can a valid characterization of the compounds under study be achieved.