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Further evidence for the stability of methylenechloronium ylide, H 2 CCIH. A neutralization‐reionization ion‐dissociation experiment
Author(s) -
Wesdemiotis C.,
Feng R.,
Baldwin M. A.,
McLafferty F. W.
Publication year - 1988
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.1210230303
Subject(s) - reionization , dissociation (chemistry) , ionization , ion , excited state , chemistry , molecule , neutralization , atomic physics , physics , organic chemistry , antibody , immunology , biology
Recent theoretical and experimental studies are in conflict with our previous neutralization–reionization evidence for the surprising stability of simple ylides such as H 2 CCIH. Neutralization of [H 2 CCIH] + ˙ ions from CICH 2 COOH with Hg followed by reionization of the resulting neutral molecules with O 2 produces intense [CCIH 3 ] + ˙ parent ions. Collisionally activated dissociation of these mass‐selected ions shows that 47 ± 5% are the [H 2 CCIH] + ˙ isomer. This demonstrates that stable H 2 CCIH molecules can be formed by neutralization, surviving intact for the lifetime of the experiment (10 −6 s). Field ionization conditions effective in ionizing excited argon atoms do not produce appreciable ionization of the neutrals from [H 2 CCIH] + ˙, suggesting that the stable H 2 CCIH neutrals are not Rydberg state molecules.