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Gas-Phase Affinity Scales for Typical Ionic Liquid Moieties Determined by using Cooks' Kinetic Method.

Joana Vitorino1, João Paulo Leal1,2, Manuel E Minas da Piedade3

  • 1Centro de Química e Bioquímica e Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1649-016 Lisboa (Portugal).

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|April 21, 2015
PubMed
Summary

Ionic liquid interactions were quantified using mass spectrometry, revealing how cation and anion structures influence binding affinities. This study provides key insights into the fundamental forces governing ionic liquid formation and properties.

Keywords:
electrostatic interactionsgas-phase reactionsionic liquidskineticsmass spectrometry

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Area of Science:

  • Physical Chemistry
  • Mass Spectrometry
  • Ionic Liquids

Background:

  • Gas-phase affinity studies offer quantitative insights into the interactions within ionic liquids (ILs).
  • Understanding these interactions is crucial for tailoring IL properties based on cation and anion structures.

Purpose of the Study:

  • To determine gas-phase affinity scales for cations with the bis(trifluoromethylsulfonyl)imide anion ([NTf2]-) and for anions with the 1-butyl-3-methylimidazolium cation ([C4mim]+).
  • To correlate these affinities with the structural characteristics of the involved ionic species.

Main Methods:

  • Utilizing electrospray ionization quadrupole ion-trap and Fourier transform ion cyclotron resonance mass spectrometry.
  • Employing Cooks' kinetic method to derive quantitative affinity scales.

Main Results:

  • Two distinct affinity scales were generated, detailing cation-anion interaction strengths.
  • The results provide a basis for comparing the influence of various cationic and anionic moieties on IL stability.

Conclusions:

  • The study successfully established quantitative gas-phase affinity scales for key ionic liquid components.
  • Findings highlight the structure-dependent nature of interactions within ionic liquids, aiding in their rational design.