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Molecular interaction between three novel amino acid based deep eutectic solvents with surface active ionic liquid: A

Manoj Kumar Banjare1, Benvikram Barman1, Kamalakanta Behera2

  • 1Department of Chemistry (MSS), MATS University, Pagaria Complex, Pandri, Raipur, Chhattisgarh, 492004, India.

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|August 22, 2024
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Summary

Amino acid-based deep eutectic solvents (DESs) enhance micelle formation for the ionic liquid [Dmim][Cl]. These DESs lower critical micelle concentrations, with DES2 showing the strongest effect, aiding solubility and applications.

Keywords:
1-Decyl-3-methylimidazolium chlorideAmino acid-based deep eutectic solventsCMCFTIRInterfacial parameters

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Area of Science:

  • Physical Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Ionic liquids (ILs) exhibit unique properties but can have limited solubility and micellization behavior.
  • Deep eutectic solvents (DESs) offer tunable properties and are explored as environmentally benign alternatives.
  • Amino acid-based DESs present novel structures for interaction studies with ILs.

Purpose of the Study:

  • To investigate the interaction between a surface-active ionic liquid, 1-decyl-3-methylimidazolium chloride ([Dmim][Cl]), and three novel amino acid-based DESs.
  • To evaluate the effect of these DESs on the micellar properties of [Dmim][Cl].
  • To understand the intermolecular interactions governing the self-assembly of [Dmim][Cl] in DES solutions.

Main Methods:

  • Surface tension measurements.
  • Fluorescence spectroscopy.
  • UV-visible spectroscopy.
  • Fourier transform infrared (FTIR) spectroscopy.

Main Results:

  • All studied DESs successfully facilitated micellization of [Dmim][Cl], lowering critical micelle concentrations (CMC).
  • The effectiveness in promoting [Dmim][Cl] aggregation followed the order: DES2 > DES1 > DES3.
  • DES2 significantly reduced CMC and surface tension at CMC, indicating enhanced micellization.
  • FTIR analysis confirmed molecular interactions and structural changes supporting micelle formation.

Conclusions:

  • Amino acid-based DESs act as effective co-solvents, promoting the micellization of the ionic liquid [Dmim][Cl].
  • The observed enhancement in micellization is attributed to solvophobic effects and intermolecular hydrogen bonding.
  • These findings highlight the potential of DESs in improving the colloidal properties and applications of ILs, particularly in areas like solubility, catalysis, and pharmaceuticals.