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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Vaporisation of a dicationic ionic liquid.

Kevin R J Lovelock1, Alexey Deyko, Jo-Anne Corfield

  • 1School of Chemistry, University of Nottingham, UK.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|December 11, 2008
PubMed
Summary
This summary is machine-generated.

This study reveals that dicationic ionic liquids evaporate as neutral ion triplets, achieving the highest heat of vaporization recorded. These triplets can then form charged ions, as evidenced in mass spectrometry results.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Ionic Liquids

Background:

  • Ionic liquids (ILs) are salts that are liquid below 100°C, with tunable properties.
  • Understanding the vaporization behavior of ILs is crucial for their application in various fields.
  • Dicationic ionic liquids (DILs) possess unique characteristics due to their double positive charge.

Purpose of the Study:

  • To investigate the vaporization mechanism of a specific dicationic ionic liquid, [C(3)(C(1)Im)(2)][Tf(2)N](2).
  • To determine the heat of vaporization for this dicationic ionic liquid.
  • To analyze the species formed during and after the vaporization process.

Main Methods:

  • Experimental investigation of the vaporization of [C(3)(C(1)Im)(2)][Tf(2)N](2).
  • Mass spectrometry analysis to identify the resulting ions and neutral species.
  • Determination of the heat of vaporization through experimental measurements.

Main Results:

  • The dicationic ionic liquid [C(3)(C(1)Im)(2)][Tf(2)N](2) exhibits the highest heat of vaporization reported to date.
  • Vaporization occurs via the formation of neutral ion triplets, not individual ions.
  • Mass spectrum confirms the presence of the dication attached to an anion and the bare dication.

Conclusions:

  • Dicationic ionic liquids can evaporate as neutral ion triplets, challenging previous assumptions.
  • The observed high heat of vaporization is attributed to the stability of these neutral triplets.
  • This finding has implications for the design and application of ionic liquids, particularly in high-temperature processes.