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From a molecular perspective, an ideal solution is one in which the intermolecular interactions between unlike molecules are, on average, the same as those between like molecules. This is the case for ideal gas mixtures, where the molecules are far apart and do not interact with each other. However, for condensed phases like liquids or solids, the molecules are close together and interact with each other. In an ideal solution, the molecules of different species are so similar to each other that...
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Ionic liquids-Conventional solvent mixtures, structurally different but dynamically similar.

Juan C Araque1, Jeevapani J Hettige1, Claudio J Margulis1

  • 1Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, USA.

The Journal of Chemical Physics
|October 10, 2015
PubMed
Summary

Ionic liquids (ILs) and conventional solvent mixtures exhibit similar solute dynamics, featuring distinct "stiff" and "soft" frictional regions. This dynamic behavior arises from charge distribution in ILs and component properties in solvent mixtures.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Chemical Dynamics

Background:

  • Pure ionic liquids (ILs) possess inherent mixture-like characteristics due to their cationic and anionic components, exhibiting dual charge and apolar properties.
  • Previous research revealed unique dynamical behaviors in ILs, attributed to their inherent duality, affecting small neutral solutes.
  • The question arises whether this behavior is exclusive to ILs or also present in conventional solvent mixtures with tunable viscosity.

Purpose of the Study:

  • To investigate if the interesting dynamical behavior observed in ionic liquids (ILs) is also present in conventional solvent mixtures, specifically dimethyl sulfoxide/glycerol.
  • To compare the dynamical characteristics of ILs and conventional viscous solvent mixtures from a small solute's perspective.

Main Methods:

  • Comparative analysis of dynamical behavior in ionic liquids and conventional solvent mixtures (dimethyl sulfoxide/glycerol).
  • Focus on solute-solvent interactions and friction experienced by small neutral solutes.
  • Examination of cage and jump diffusive regimes in both types of solvent systems.

Main Results:

  • Viscous conventional solvent mixtures, despite structural differences from ILs, exhibit similar dynamical behaviors.
  • Both ILs and conventional solvent mixtures present spatially varying friction for small solutes, with 'stiff' and 'soft' regions.
  • In ILs, these regions correspond to charge-enhanced/depleted areas, while in conventional solvents, they relate to the distinct frictional properties of the constituent components.

Conclusions:

  • The dynamical behavior characterized by spatially heterogeneous friction is not unique to ionic liquids but is also observed in conventional viscous solvent mixtures.
  • Dynamically, ILs and conventional solvent mixtures can be surprisingly similar, despite significant structural differences.
  • The findings suggest that the underlying principles governing solute dynamics in these distinct solvent systems share common features related to local friction heterogeneity.