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Prominent Composition-Dependent Dynamics Decoupling in the Choline Chloride-Glycerol Deep Eutectic Solvent System.

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Deep eutectic solvents (DESs) show dynamic heterogeneity due to hydrogen bonding. Local environments within choline chloride:glycerol (ChCl:Gly) DESs differ from bulk properties, revealing short-range organization.

Keywords:
DESDeep eutectic solventsType III DESfluorescence anisotropyviscosity decoupling

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Area of Science:

  • Physical chemistry
  • Materials science
  • Supramolecular chemistry

Background:

  • Deep eutectic solvents (DESs) are complex mixtures with unique properties.
  • Dynamic heterogeneity in DESs arises from intricate hydrogen bonding networks.
  • Understanding local solvent environments is crucial for DES applications.

Purpose of the Study:

  • To investigate the local organization and dynamic heterogeneity in a choline chloride:glycerol (ChCl:Gly) DES.
  • To examine how system composition affects the local environments probed by different molecules.
  • To compare local DES environments with bulk properties like viscosity.

Main Methods:

  • Utilized time-resolved reorientation dynamics of three chromophores (perylene, oxazine 725, rose bengal).
  • Probed local environments of varying polarity within the ChCl:Gly DES.
  • Analyzed the influence of DES constituent mole ratios on observed dynamics.

Main Results:

  • Chromophore-sensed environments differed significantly from bulk viscosity predictions.
  • Local environments showed minimal changes despite variations in DES constituent mole ratios.
  • Evidence of short-range organization distinct from long-range bulk properties was observed.

Conclusions:

  • DESs exhibit significant dynamic heterogeneity and short-range structural organization.
  • Local solvent environments are not accurately represented by bulk viscosity.
  • The findings highlight the complex microheterogeneous nature of DESs.