Energy-variable collision-induced dissociation study of 1,3,5-trisubstituted 2-pyrazolines by electrospray mass spectrometry

2007 ◽  
Vol 21 (11) ◽  
pp. 1799-1808 ◽  
Author(s):  
Sándor Kéki ◽  
Lajos Nagy ◽  
János Török ◽  
Katalin Tóth ◽  
Albert Lévai ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Electrospray Mass Spectrometry ◽  
Collision Induced Dissociation ◽  
Energy Variable

Collision-Induced Dissociation of Imidazolium-Based Zwitterionic Liquids

2009 ◽  
Vol 15 (4) ◽  
pp. 471-478 ◽  
Author(s):  
Ilva Nakurte ◽  
Peteris Mekss ◽  
Kristaps Klavins ◽  
Andris Zicmanis ◽  
Galina Vavilina ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Electrospray Mass Spectrometry ◽  
Collision Energy ◽  
Alkyl Chain ◽  
Collision Induced Dissociation ◽  
Cone Voltage ◽  
Fragmentation Pathways ◽  
Fragment Ions ◽  
Molecular Stability ◽  
Imidazolium Ring

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 Cnon 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.

Analysis of Trace Level Perchlorate in Drinking Water and Ground Water by Electrospray Mass Spectrometry

1998 ◽  
Author(s):  
Rebecca A. Clewell ◽  
Wayne T. Brashear ◽  
David T. Tsui ◽  
Sanwat Chaudhuri ◽  
Rachel S. Cassady
Keyword(s):  
Mass Spectrometry ◽  
Drinking Water ◽  
Ground Water ◽  
Electrospray Mass Spectrometry ◽  
Trace Level
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