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Vapourisation of ionic liquids.

James P Armstrong1, Christopher Hurst, Robert G Jones

  • 1Department of Physical Chemistry, School of Chemistry, University Park, University of Nottingham, Nottingham, UK.

Physical Chemistry Chemical Physics : PCCP
|February 16, 2007
PubMed
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Eight common imidazolium ionic liquids were evaporated and analyzed. Their heats of vaporization depend on coulombic interactions, with an electrostatic model relating these heats to molar volumes.

Area of Science:

  • Physical Chemistry
  • Materials Science

Background:

  • Ionic liquids (ILs) are salts that are liquid at low temperatures.
  • Understanding their thermodynamic properties, such as enthalpy of vaporization, is crucial for applications.

Purpose of the Study:

  • To determine the heats of vaporization for common imidazolium-based ionic liquids.
  • To investigate the factors influencing their vaporization behavior.
  • To develop a model correlating vaporization enthalpy with physical properties.

Main Methods:

  • Evaporation of eight imidazolium-based ionic liquids under ultra-high vacuum.
  • Analysis of vapor composition using line-of-sight mass spectrometry.
  • Determination of heats (enthalpy) of vaporization.

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Main Results:

  • Ionic liquids were found to evaporate as intact ion pairs.
  • Heats of vaporization are primarily governed by coulombic interactions in both liquid and gas phases.
  • An electrostatic model successfully related heats of vaporization to molar volumes.

Conclusions:

  • The vaporization of imidazolium ionic liquids occurs as ion pairs.
  • Coulombic forces are the dominant factor controlling their enthalpy of vaporization.
  • Molar volume is a key parameter for predicting vaporization enthalpy using electrostatic principles.