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Related Concept Videos

Crown Ethers02:36

Crown Ethers

Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules take.

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Related Experiment Video

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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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Responsive supramolecular gels constructed by crown ether based molecular recognition.

Zhishen Ge1, Jinming Hu, Feihe Huang

  • 1Hefei National Laboratory for Physical Sciences at the Microscale, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, PR China.

Angewandte Chemie (International Ed. in English)
|January 29, 2009
PubMed
Summary
This summary is machine-generated.

Responsive supramolecular gels were created using poly(epsilon-caprolactone) chains. These novel gels show reversible transitions between gel and solution states in response to temperature and pH changes.

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Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Supramolecular gels offer tunable properties for advanced applications.
  • Stimuli-responsive materials are crucial for smart technologies.
  • Poly(epsilon-caprolactone) based materials are widely studied for their biocompatibility and versatility.

Purpose of the Study:

  • To construct novel supramolecular gels using well-defined poly(epsilon-caprolactone) architectures.
  • To investigate the formation of pseudorotaxane linkages for gelation.
  • To evaluate the stimuli-responsive behavior (thermo- and pH-induced) of the resulting gels.

Main Methods:

  • Synthesis of crown ether-terminated four-arm star poly(epsilon-caprolactone) (PCL-DB24C8).
  • Synthesis of dibenzylammonium-terminated two-arm PCL-DBAS.
  • Exploitation of host-guest interactions (pseudorotaxane formation) for supramolecular assembly.
  • Characterization of gel-sol transition upon changes in temperature and pH.

Main Results:

  • Successful construction of supramolecular gels from PCL-DB24C8 and PCL-DBAS.
  • Demonstration of reversible gel-sol transitions induced by temperature changes.
  • Confirmation of reversible gel-sol transitions induced by pH variations.
  • The supramolecular gels exhibit tunable responsive properties.

Conclusions:

  • Novel responsive supramolecular gels were successfully fabricated.
  • The gels demonstrate efficient thermo- and pH-induced reversible gel-sol transitions.
  • This work provides a new platform for developing smart polymeric materials with controllable properties.