Abundant dipositively charged protonated a2 and a3 ions from diproline and triproline

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Junfang Zhao
  • Chi-Kit Siu
  • Tujin Shi
  • Alan C. Hopkinson
  • K.W. Michael Siu

Detail(s)

Original languageEnglish
Pages (from-to)4963-4969
Journal / PublicationJournal of Physical Chemistry B
Volume113
Issue number14
Publication statusPublished - 9 Apr 2009
Externally publishedYes

Abstract

Abundant (a2 + H)2+ from diproline and (a3 + H) 2+ from triproline were observed via collisionally activated charge disproportionation of [La(peptide)(CH3CN) 1,2] 3+. These small, dipositive ions with the charges formally located on the peptide backbone are stabilized by charge delocalization onto the pyrrolidine-derived rings, making their formation competitive against other monopositive ions. The (a2 + H) 2+ and (a3 + H) 2+ ions from diproline and triproline are major products in contrast with those derived from triglycine, whose unprecedented and surprising observations were recently reported (Shi et al. Angew. Chem., Int. Ed. 2008, 47, 8288-8291). © 2009 American Chemical Society.

Citation Format(s)

Abundant dipositively charged protonated a2 and a3 ions from diproline and triproline. / Zhao, Junfang; Siu, Chi-Kit; Shi, Tujin et al.
In: Journal of Physical Chemistry B, Vol. 113, No. 14, 09.04.2009, p. 4963-4969.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review