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Minimizing Ionic Interference: An APCI-MS Strategy for Real-Time Reaction Monitoring in Ionic Liquids.

Chiara Salvitti1, Alessia Di Noi1, Francesca Cosentino1

  • 1Department of Chemistry and Technology of Drugs, "Sapienza" University of Rome, Rome, Italy.

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|September 10, 2025
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Summary

This study introduces an atmospheric pressure chemical ionization mass spectrometry (APCI-MS) method for real-time reaction monitoring in ionic liquids (ILs). This technique overcomes signal interference, enabling efficient analysis of chemical transformations in IL media.

Keywords:
N‐heterocyclic carbenesatmospheric pressure chemical ionizationionic liquidsmass spectrometryreaction mechanisms

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Area of Science:

  • Analytical Chemistry
  • Green Chemistry

Background:

  • Ionic liquids (ILs) are versatile solvents in green chemistry, but their ionic nature complicates reaction monitoring.
  • Traditional mass spectrometry struggles with IL interference, hindering real-time analysis of product formation and intermediates.

Purpose of the Study:

  • To develop an atmospheric pressure chemical ionization mass spectrometry (APCI-MS) method for effective reaction monitoring in ionic liquids.
  • To overcome the limitations of mass spectrometry caused by inherent ionic signals from ILs.

Main Methods:

  • Developed an APCI-MS approach to minimize interference from ionic liquids.
  • Constructed calibration curves using three model reactions: Knoevenagel condensation, oxidative esterification, and benzoin addition.
  • Directly sampled reaction mixtures without quenching to estimate product yields.

Main Results:

  • The APCI-MS method successfully minimized interference from the ionic liquid.
  • A strong correlation was observed between product yields determined by APCI-MS and those from isolated products.
  • Demonstrated the feasibility of real-time monitoring for reactions in ILs.

Conclusions:

  • The developed APCI-MS approach enables real-time monitoring of reactions in ionic liquids.
  • This method eliminates the need for time-consuming extraction steps and preserves mechanistic information.
  • Offers a valuable tool for advancing green synthetic applications utilizing ionic liquids.