The role of ionic liquids in co-catalysis of Baylis-Hillman reaction: interception of supramolecular species via electrospray ionization mass spectrometry

2006 ◽  
Vol 19 (11) ◽  
pp. 731-736 ◽  
Author(s):  
Leonardo Silva Santos ◽  
Brenno A. DaSilveira Neto ◽  
Crestina S. Consorti ◽  
Cesar Henrique Pavam ◽  
Wanda P. Almeida ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Ionic Liquids ◽  
Electrospray Ionization ◽  
Electrospray Ionization Mass Spectrometry ◽  
Ionization Mass Spectrometry ◽  
Ionization Mass

Extractive electrospray ionization mass spectrometry of ionic liquids

2014 ◽  
Vol 6 (18) ◽  
pp. 7190 ◽  
Author(s):  
Yafei Zhou ◽  
Konstantin Chingin ◽  
Cao Li ◽  
Shuiping Yang ◽  
Saijin Xiao ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Ionic Liquids ◽  
Electrospray Ionization ◽  
Electrospray Ionization Mass Spectrometry ◽  
Ionization Mass Spectrometry ◽  
Ionization Mass

The cation−anion interaction in ionic liquids studied by extractive electrospray ionization mass spectrometry

2014 ◽  
Vol 92 (7) ◽  
pp. 611-615 ◽  
Author(s):  
Yafei Zhou ◽  
Junfeng Zhan ◽  
Xiang Gao ◽  
Cao Li ◽  
Konstantin Chingin ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Electrospray Ionization ◽  
Electrospray Ionization Mass Spectrometry ◽  
Mass Spectrometry Analysis ◽  
Ionization Mass Spectrometry ◽  
Supramolecular Organization ◽  
Ionization Mass ◽  
Spectrometry Analysis

Ionic liquids, known as green solvents, are of sustainable interest in modern chemistry, industry, and many other fields. Here, extractive electrospray ionization has been applied to transfer various room temperature ionic liquids into the gas phase for mass spectrometry analysis. Generated mass spectra display free cations (C+), anions (A–), and small salt clusters, such as C2A+ and CA2–, from strongly diluted ionic liquid samples (<10−8 mol/L) with high sensitivity and tolerance to chemical contamination. The eight ionic liquids based on the 1-butyl-3-methylimidazolium cation with different anions (OH–, HSO4–, Cl–, BF4–, AlCl4–, NO3–, Ac–, and PF6–) are investigated in the present work. Interestingly, the 1-butyl-3-methylimidazolium cation signal intensity is inversely correlated with the hydrogen bonding strength between the anion and cation. Our study indicates that the direct extractive electrospray ionization mass spectrometry analysis is a convenient method to screen ionic liquid libraries with regard to chemical composition, physicochemical properties, and supramolecular organization of ionic liquids.

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