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Reverse hydrotropy by complex formation.

Kamil Wojciechowski1, Thomas Gutberlet, Vikram Singh Raghuwanshi

  • 1Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland. kamil.wojciechowski@ch.pw.edu.pl.

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|November 22, 2014
PubMed
Summary
This summary is machine-generated.

Self-aggregation of diaza-18-crown-6 ethers (ACEs) in non-polar solvents was investigated. Dye solubilization suggested aggregate formation, but advanced spectroscopy confirmed only small reverse micelles, highlighting the need for multiple methods to confirm amphiphile self-aggregation.

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Area of Science:

  • Supramolecular Chemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Di-N-alkylated diaza-18-crown-6 ethers (ACEs) are amphiphiles studied for self-aggregation in non-polar solvents.
  • Previous interfacial tension studies suggested reverse micelle formation above ~10(-3) M ACE concentrations.

Purpose of the Study:

  • To investigate the self-aggregation behavior of three ACEs with varying alkyl chain lengths (ACE-10, ACE-16, ACE-24) in non-polar solvents.
  • To reconcile discrepancies between dye solubilization results and direct aggregate detection methods.

Main Methods:

  • Dynamic Light Scattering (DLS)
  • Fluorescence Correlation Spectroscopy (FCS)
  • (1)H NMR Diffusion Ordered Spectroscopy (DOSY)
  • Small Angle Neutron Scattering (SANS)
  • Spectrophotometry and fluorescence dye dissolution studies

Main Results:

  • DLS, FCS, and DOSY did not provide clear evidence for ACE self-aggregation.
  • SANS revealed the presence of small reverse micelles in concentrated toluene ACE solutions, likely ACE dimers forming cages for 1-2 water molecules.
  • Dye dissolution studies suggested ACEs could solubilize dyes without aggregate formation, attributed to dye-ACE complexation.

Conclusions:

  • Dye solubilization is not a reliable sole indicator of amphiphile self-aggregation in non-polar solvents.
  • Amphiphile-dye complexation can drive solubilization, potentially leading to false positive results for aggregation.
  • Confirmation of self-aggregation requires complementary techniques like SANS, especially when investigating reverse hydrotropy or lipotropy.