Evidence for the formation of acyclic ions from the radical cations and cyclic ions from the protonated molecules of α,ω-diamines upon loss of ammonia

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Fernandes, Ana M. and Correia, A.J. Ferrer and Fokkens, Roel H. and Nibbering, Nico M.M. (2002) Evidence for the formation of acyclic ions from the radical cations and cyclic ions from the protonated molecules of α,ω-diamines upon loss of ammonia. International Journal of Mass Spectrometry, 217 (1-3). pp. 55-63. ISSN 1387-3806

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Abstract:The structural characterization of the ions generated by the electron ionization-induced loss of ammonia from the molecular ions of α,ω-diamines, using ion/molecule reactions in combination with collision-induced dissociation (CID) studies, is described. The results of the experiments of ion/molecule reactions using dimethyl disulfide exclude the distonic radical cation structure for those long-lived ions proposed earlier by other authors for ions generated within a few microseconds following ionization. The unimolecular and CID characteristics of the ions [M---NH3]√+ of 1,4-diaminobutane and 1,5-diaminopentane and of their fragment ion m/z=56, are discussed in terms of the structures CH3CH2CH=CHNH2√+ and CH3CH2CH2CH=CHNH2√+ for the ions [M---NH3]√+, respectively. The structure of the closed shell ions resulting from loss of ammonia from the protonated α,ω-diamines was also probed through the CID spectra of model ions prepared by chemical ionization with methane in the chemical ionization source of the mass spectrometer.
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Copyright:© 1968 Elsevier
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Link to this item:http://purl.utwente.nl/publications/74723
Official URL:http://dx.doi.org/10.1016/S1387-3806(02)00535-3
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