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Self-assembly of a short-chain ionic liquid within deep eutectic solvents.

Manoj Kumar Banjare1, Kamalakanta Behera2, Manmohan L Satnami1

  • 1School of Studies in Chemistry, Pt. Ravishankar Shukla University Raipur 492 010 Chhattisgarh India kallolkghosh@yahoo.com +91-771-2262583 +91-771-2263146.

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Summary

The study shows that ionic liquids (ILs) like [Bmim][OS] form more stable micelles in deep eutectic solvents (DESs) like ChCl-urea and ChCl-Gly compared to water. This enhanced micellization in DESs favors IL aggregation and has implications for drug binding studies.

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Area of Science:

  • Physical Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Ionic liquids (ILs) and deep eutectic solvents (DESs) are tunable, eco-friendly solvents with broad applications.
  • Understanding solvent effects on IL aggregation is crucial for their industrial use.
  • DESs offer unique microenvironments that can influence solute behavior.

Purpose of the Study:

  • To investigate the aggregation behavior of 1-butyl-3-methylimidazolium octylsulphate ([Bmim][OS]) in aqueous DESs.
  • To compare micelle formation of [Bmim][OS] in ChCl-urea and ChCl-Gly DESs versus water.
  • To explore the potential of these systems for IL-drug interactions.

Main Methods:

  • Steady-state fluorescence spectroscopy using pyrene and pyrene-1-carboxaldehyde as probes.
  • Dynamic Light Scattering (DLS) to determine aggregate size.
  • FT-IR spectroscopy to analyze molecular interactions.
  • Preparation of ChCl-urea and ChCl-Gly DESs in 1:2 molar ratios.

Main Results:

  • [Bmim][OS] formed larger micelles in ChCl-urea (209 nm) than in ChCl-Gly (135 nm).
  • Critical micelle concentration (CMC) decreased, and aggregation number (N_agg) increased in DESs compared to water.
  • Micellization of [Bmim][OS] was significantly favored in aqueous DES solutions.
  • FT-IR confirmed molecular interactions between IL and DES components.
  • IL-drug binding studies with promazine hydrochloride (PH) were initiated.

Conclusions:

  • Aqueous DESs significantly enhance the micellization of the ionic liquid [Bmim][OS].
  • The choice of DES influences the size and stability of IL aggregates.
  • These findings highlight the potential of DESs as media for modulating IL behavior and for applications like drug delivery.