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Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators
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Self-assembling chiral gelators for fluorinated media.

Marie Côte1, Tim Nicholls, David W Knight

  • 1School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 1, 2009
PubMed
Summary
This summary is machine-generated.

Researchers discovered that stereogenic centers in bis-(alpha,beta-dihydroxy ester)s are crucial for thermoreversible gelation in fluorinated solvents like 2H,3H-perfluoropentane (HPFP) and 1H,1H-heptafluorobutanol (HFB). This gelation is driven by hydrogen bonding, enabling new material formulations.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Fluorinated Compounds

Background:

  • Partially and fully fluorinated liquids present formulation challenges due to their lipophobic and hydrophobic properties.
  • Controlling the viscosity and solubility of fluorinated solvents requires identifying suitable self-associating materials.
  • Developing novel gelators for fluorinated media is an active area of research.

Purpose of the Study:

  • To investigate the requirements for thermoreversible gelation in mixtures of partially fluorinated liquids.
  • To determine the role of molecular structure, specifically stereogenic centers, in the gelation process.
  • To characterize the self-assembly behavior and thermodynamic properties of the gelator-solvent system.

Main Methods:

  • Synthesis and characterization of bis-(alpha,beta-dihydroxy ester)s.
  • Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) to study gelation and melting behavior.
  • Small-angle neutron scattering (SANS) to probe the microstructure of the gels.

Main Results:

  • The presence of stereogenic centers in bis-(alpha,beta-dihydroxy ester)s was found to be essential for thermoreversible gelation.
  • Gelation is driven by hydrogen bonding, inducing a specific nonpreferred conformation in the gelator molecule.
  • Thermodynamic analysis indicated the formation of three to four hydrogen bonds, consistent with the gelator's end-group structure.
  • SANS revealed common fibrillar structures, but their dimensions did not correlate with the gelator's molecular structure.

Conclusions:

  • Stereogenic centers in bis-(alpha,beta-dihydroxy ester)s are critical for enabling thermoreversible gelation in fluorinated solvent mixtures.
  • Hydrogen bonding plays a key role in driving the self-assembly and gelation process.
  • The findings provide insights into the design of novel gelators for challenging fluorinated media.