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Just Add Salt: A Mass Spectrometric Analysis Method for Imaging Anion-Exchanged Poly(Ionic Liquid)s
Jan Steinkoenig1,2, Martina M Cecchini3, Anja S Goldmann1,2
1Preparative Macromolecular Chemistry, Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), Engesserstr. 18, 76128, Karlsruhe, Germany.
Macromolecular Rapid Communications
|August 30, 2016
Summary
This study introduces a new mass spectrometry method for analyzing poly(ionic liquid)s (PILs) with weakly coordinating anions. The technique enables rapid, quantitative anion exchange and precise structural identification of modified PILs.
Area of Science:
- Polymer Chemistry
- Analytical Chemistry
- Mass Spectrometry
Background:
- Poly(ionic liquid)s (PILs) are advanced polymers with tunable properties.
- Characterizing PILs, especially after modification, can be challenging.
- Developing efficient methods for structural elucidation of PILs is crucial.
Purpose of the Study:
- To report the first mass spectrometric analysis of poly(ionic liquid)s containing weakly coordinating anions.
- To introduce a fast, simple, and quantitative postmodification method for PILs.
- To investigate the influence of weakly coordinating anions on PIL ionization behavior.
Main Methods:
- Utilized in-source collision-induced dissociation-Orbitrap mass spectrometry (MS).
- Employed a postmodification strategy to introduce weakly coordinating anions via ion exchange.
- Analyzed poly(vinylbenzylpyridinium chloride) (p([VBPy]Cl)) using silver salts (AgX, where X = NO3-, CF3CO2-, BF4-).
Main Results:
- Demonstrated precise structural elucidation of ion-exchanged p([VBPy]Cl).
- Confirmed quantitative anion exchange on rapid time scales, with no residual chloride observed.
- Showcased filtration as an effective sample preparation technique.
- Detailed the influence of weakly coordinating anions on PIL ionization.
Conclusions:
- The developed MS protocol provides a powerful tool for analyzing modified PILs.
- The postmodification method is efficient, quantitative, and rapid.
- Weakly coordinating anions significantly impact the ionization behavior of PILs, aiding in their characterization.
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