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Electrospray mass spectrometric studies of some phosphonium cations
Author(s) -
Colton Ray,
Traeger John C.,
Harvey Justin
Publication year - 1992
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.1210271012
Subject(s) - phosphonium , chemistry , mass spectrum , dichloromethane , fragmentation (computing) , phosphine , electrospray ionization , methyl iodide , dissociation (chemistry) , mass spectrometry , iodide , ion , electrospray , methanol , analytical chemistry (journal) , inorganic chemistry , medicinal chemistry , organic chemistry , chromatography , solvent , computer science , catalysis , operating system
A series of methylphosphonium cations derived from mono‐ and polyphosphines were generated by interaction of the phosphine with methyl iodide. Electrospray mass spectra of the cations were obtained directly from dichloromethane–methanol solutions. In all cases the intact phosphonium cations were observed, often as the base peak, emphasizing the ‘soft’ nature of this type of ionization. Some of the polyphosphines showed additional peaks at m / z 16 and 32 units higher than the molecular ions due to oxidation of the non‐methylated phosphine groups. Collisionally activated dissociation mass spectra show a consistent mode of fragmentation with the formation of alkene ions being dominant. Where comparisons arc possible, there is a close correlation with the electron impact mass spectra of the neutral phosphines.