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Helical Polybissilsesquioxane Bundles Prepared Using a Self-Templating Approach.

Qingfeng Wang1, Shuwei Lin1, Jiaming Qin1

  • 1Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, P.R. China.

Chirality
|October 7, 2015
PubMed
Summary

Chiral polybissilsesquioxanes with single-handed helical structures were synthesized. These materials show potential for enantioseparation and nitrobenzene adsorption due to their unique helical morphology.

Keywords:
chiralityhelicityoptical activitypolybissilsesquioxaneself-assembly

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Supramolecular Chemistry

Background:

  • Single-handed helical polybissilsesquioxanes are of significant interest for applications in asymmetric catalysis and chiral separations.
  • Developing efficient methods for synthesizing these chiral materials is crucial for advancing their practical use.

Purpose of the Study:

  • To synthesize novel chiral biphenylene-bridged bissilsesquioxanes.
  • To prepare single-handed helical polybissilsesquioxane bundles using a self-templating approach.
  • To investigate the structural, chiral, and adsorption properties of the synthesized polybissilsesquioxanes.

Main Methods:

  • Synthesis of chiral biphenylene-bridged bissilsesquioxanes.
  • Self-assembly in ethanol and characterization using field emission scanning electron microscopy (FESEM).
  • Circular dichroism (CD) spectroscopy for chiral analysis.
  • Polycondensation for creating helical polybissilsesquioxane bundles.
  • Wide-angle X-ray diffraction (WAXD) for structural analysis.

Main Results:

  • Bissilsesquioxanes self-assembled into helical bundles with single-handed chirality confirmed by CD spectroscopy.
  • Single-handed helical polybissilsesquioxane bundles were successfully prepared via a self-templating polycondensation method.
  • Polycondensation led to shorter helical pitches due to shrinkage; WAXD indicated no π-π interactions.
  • Chirality was effectively transferred from bissilsesquioxane assemblies to the resulting polybissilsesquioxanes.

Conclusions:

  • Novel chiral biphenylene-bridged bissilsesquioxanes can self-assemble into helical structures.
  • A self-templating approach enables the synthesis of single-handed helical polybissilsesquioxane bundles with transferred chirality.
  • These helical polybissilsesquioxanes demonstrate potential for enantioseparation and adsorption applications.