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Novel resorcinarene-based pH-triggered gelator.

Scott R Haines1, Roger G Harrison

  • 1Department of Chemistry and Biochemistry, Brigham Young University, C100 BNSN, Provo, UT 84602, USA.

Chemical Communications (Cambridge, England)
|December 14, 2002
PubMed
Summary

Iminodiacetate resorc[4]arene forms clear, pH-reversible gels by aggregating molecules at low pH. These gels create a water-trapping molecular mesh, offering potential applications in materials science.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Resorcinarene derivatives are known for their self-assembly properties.
  • pH-responsive materials are of interest for controlled release and sensing applications.
  • Understanding gelation mechanisms is crucial for designing novel soft materials.

Purpose of the Study:

  • To investigate the gelation behavior of iminodiacetate resorc[4]arene.
  • To characterize the physical and chemical properties of the resulting gels.
  • To elucidate the mechanism of pH-induced gelation.

Main Methods:

  • Solution preparation and pH adjustment.
  • Gelation observation and stability testing (inversion, temperature).
  • Proton Nuclear Magnetic Resonance (1H NMR) spectroscopy.
  • Scanning Electron Microscopy (SEM).

Main Results:

  • Iminodiacetate resorc[4]arene forms clear, stable gels upon lowering the pH below 2.5 (for concentrations > 7.6 mM).
  • The gels exhibit pH-reversible properties and are stable to inversion but have limited thermal stability.
  • 1H NMR indicated changes in the iminodiacetate group's chemical environment at the gelation pH.
  • SEM revealed the gel's structure consists of interweaving long strands forming a molecular mesh.

Conclusions:

  • Iminodiacetate resorc[4]arene acts as a pH-responsive gelator.
  • The gelation mechanism involves molecular aggregation driven by pH changes affecting the iminodiacetate moiety.
  • The self-assembled fibrillar network observed via SEM is responsible for water entrapment and gel formation.

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