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Secondary Dissociation Reactions of C 2 H 2 N + and CHN 2 + Ions in the Charge Separation Mass Spectra of Five‐membered Nitrogen Heterocycles
Author(s) -
Hsieh Shizuka,
Eland John H. D.
Publication year - 1996
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/(sici)1096-9888(199609)31:9<1054::aid-jms395>3.0.co;2-0
Subject(s) - chemistry , dication , fragmentation (computing) , ion , mass spectrum , dissociation (chemistry) , protonation , metastability , photochemistry , tetrazole , mass spectrometry , collision induced dissociation , tandem mass spectrometry , stereochemistry , organic chemistry , computer science , operating system , chromatography
Dication dissociations of the five‐membered nitrogen heterocycles (pyrrole, imidazole, pyrazole, 1,2,3‐triazole, 1,2,4‐triazole and tetrazole) were investigated using charge separation mass spectrometry. Differences in the spectra for isomer pairs reflect an absence of C,N scrambling prior to fragmentation. Kinetic energy releases show that the rapid charge separations occur from a ring configuration but slow metastable decays proceed by ring opening. The major charge separation reactions produce the protonated analogues of HCN and N 2 , HCNH + and HN 2 + ; the complementary partner ions, C 2 H 2 N + and CHN 2 + , undergo secondary decay to HCNH + , HCN or N 2 , which can be compared with similar reactions of these ions in collision‐induced dissociation.