Abstract

European Journal of Mass Spectrometry
Volume 15 Issue 4, Pages 471–478 (2009)
doi: 10.1255/ejms.997

Collision-induced dissociation of imidazolium-based zwitterionic liquids

Ilva Nakurte,^* Peteris Mekss, Kristaps Klavins, Andris Zicmanis, Galina Vavilina and Svetlana Dubrovina
Faculty of Chemistry, University of Latvia, 48 Kr. Valdemara Str., Riga LV-1013, Latvia. E-mail: ilva.nakurte@gmail.com

Fragmentation pathways of some imidazolium based zwitterionic liquids—3-(3-alkyl-1- imidazolio)-propane sulfonates and 3-(2-methyl-3-alkyl-1-imidazolio)-propane sulfonates—have been studied by tandem electrospray mass spectrometry and collision- induced dissociation. The relative abundances of the lowest energy fragment ions depend on the length of the alkyl chain at the ^IIN of the imidazolium ring and the cone voltage. The first fragment ions originate from the scission of C_{non aromatic}–N bond of compounds investigated, but with increasing collision energy, scission of C–C bonds occurs. Aggregates of the general formula [(M + H)_x + (M)_y]⁺ (x;y = 1–2) formed. Methyl substituted zwitterionic liquids show higher molecular stability than 3-(3-alkyl-1-imidazolio)-propane sulfonates.

Keywords: zwitterionic liquids, mass spectrometry, electrospray ionization, fragmentation, collision-induced dissociation

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