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Dipositively Charged Protonated a3 and a2 Ions: Generation by Fragmentation of [La(GGG)(CH3CN)2]3+

Authors

  • Tujin Shi Dr.,

    1. Centre for Research in Neurodegenerative Diseases, University of Toronto, Toronto, ON, M5S 3H2 (Canada)
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  • Chi-Kit Siu Dr.,

    1. Department of Chemistry, Centre for Research in Mass Spectrometry, York University, 4700 Keele Street, Toronto, ON, M3J 1P3 (Canada), Fax: (+1) 416-736-5936
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  • K. W. Michael Siu Prof.,

    1. Department of Chemistry, Centre for Research in Mass Spectrometry, York University, 4700 Keele Street, Toronto, ON, M3J 1P3 (Canada), Fax: (+1) 416-736-5936
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  • Alan C. Hopkinson Prof.

    1. Department of Chemistry, Centre for Research in Mass Spectrometry, York University, 4700 Keele Street, Toronto, ON, M3J 1P3 (Canada), Fax: (+1) 416-736-5936
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  • This study was supported by the Natural Sciences and Engineering Research Council (NSERC) of Canada and made possible by the facilities of the Shared Hierarchical Academic Research Computing Network (SHARCNET: www.sharcnet.ca). We thank Dr. Julia Laskin for helpful discussions on the RRKM modeling.

Abstract

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Stay positive! Dissociation of a lanthanum complex of triglycine generates a novel diprotonated iminium ion (see picture; gray C, white H, light blue La, dark blue N, red O), which undergoes rich fragmentations. This class of peptide fragment ions provides a system to model multiple charge effects and is potentially useful in peptide sequencing.

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