Predicting solubility of ionic compounds in ionic liquids

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SUMMARY

The discussion centers on predicting the solubility of ionic compounds such as KCl and NaBr in ionic liquids like 1-ethyl-3-methylimidazolium tetrafluoroborate and tetrabutylammonium bromide. The complexity of dissolution and dissociation processes in ionic liquids is highlighted, particularly due to the asymmetry and conformational flexibility of the constituent ions. While there is emerging data on gases dissolved in ionic liquids that aids in assessing computational models, the discussion indicates a lack of straightforward guidelines for maximizing solubility in ionic liquids. Interest in the application of ionic liquids in lanthanide and actinide chemistry is noted as a relevant area for further exploration.

PREREQUISITES
  • Understanding of ionic liquids (ILs) and their properties
  • Knowledge of solubility principles for ionic compounds
  • Familiarity with computational modeling in chemistry
  • Basic concepts in lanthanide and actinide chemistry
NEXT STEPS
  • Research computational models for predicting solubility in ionic liquids
  • Explore the role of ionic liquids in greening synthetic chemistry
  • Investigate the solubility characteristics of lanthanides and actinides in ionic liquids
  • Study the effects of asymmetry and conformational flexibility on ionic liquid behavior
USEFUL FOR

Chemists, materials scientists, and researchers interested in ionic liquids and their applications in solubility and environmental chemistry.

uby
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This question probably belittles the complexity of the issue, but I thought I'd ask anyway:

Are there any reasonable methods by which the solubility of ionic compounds (e.g., KCl, NaBr, CaO, etc.) in ionic liquids (e.g., 1-ethyl-3-methylimidazolium tetrafluoroborate, tetrabutylammonium bromide) can be predicted? For example, if I wanted to maximize the concentration of dissolved KCl, I'd like to have some guidelines to follow by which I can select the most appropriate ionic liquid.

Given that the ionic liquids can display such low melting temperatures due to the asymmetry and conformational flexibility of its constituent ions, I'd guess that the dissolution and dissociation of solid ionic compounds would be a complex process with difficult-to-predict ionic mixing/coordination in the liquid.
 
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I recall this mention of there finally being enough data for gases dissolved in ionic liquids (ILs) to establish a "test set" to assess computational models the other year. Most of what I have seen in terms of rationalizing the solubility characteristics of ILs are in relation to its role in "greening" up synthetic chemistry and its applications (mixtures with organic solvents; various common synthetic starting materials and products/intermediates; and so on). Weirdly, I do recall interest in ILs with regard to lanthanide and actinide chemistry (including environmental applications), which is probably the closest to your inquiry about ionic compounds in ionic liquids. I am fairly certain it was not at the pithy "here are a few rules to remember" level, though.

I've never worked with ILs in any substantive manner, so hopefully someone more experienced will come around on this topic. Also, if you want me to run down my partially jogged memory for citations for the above, let me know.
 
Mike H said:
I recall this mention of there finally being enough data for gases dissolved in ionic liquids (ILs) to establish a "test set" to assess computational models the other year. Most of what I have seen in terms of rationalizing the solubility characteristics of ILs are in relation to its role in "greening" up synthetic chemistry and its applications (mixtures with organic solvents; various common synthetic starting materials and products/intermediates; and so on). Weirdly, I do recall interest in ILs with regard to lanthanide and actinide chemistry (including environmental applications), which is probably the closest to your inquiry about ionic compounds in ionic liquids. I am fairly certain it was not at the pithy "here are a few rules to remember" level, though.

I've never worked with ILs in any substantive manner, so hopefully someone more experienced will come around on this topic. Also, if you want me to run down my partially jogged memory for citations for the above, let me know.

Thanks Mike. Your suggestion regarding actinide/lanthanide chemistry in ionic liquids has turned up some interesting results!