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Near-Infinite-Chain Polymers with Ge=Ge Double Bonds.

Anna-Lena Thömmes1, Thomas Büttner1, Bernd Morgenstern2

  • 1Krupp-Chair for General and Inorganic Chemistry, Saarland University, 66123, Saarbrücken, Germany.

Angewandte Chemie (International Ed. in English)
|October 23, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed soluble conjugated polymers with germanium-germanium double bonds using heavier acyclic diene metathesis (HADMET). These polymers exhibit high degrees of polymerization and form ordered, ladder-like structures.

Keywords:
conjugated polymersdispersion interactionsself-assemblythin filmsσ,π-conjugation

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Chemistry

Background:

  • Conjugated polymers with heavier p-block elements are scarce.
  • Previous synthesis of Ge=Ge polymers yielded insoluble materials with low polymerization degrees.

Purpose of the Study:

  • To synthesize soluble conjugated polymers incorporating germanium-germanium double bonds.
  • To investigate the conjugation, assembly, and structural properties of these novel polymers.

Main Methods:

  • Heavier acyclic diene metathesis (HADMET) polymerization with long alkyl chains.
  • Diffusion-ordered NMR spectroscopy (DOSY) and dynamic light scattering (DLS) for polymerization degree.
  • UV/Vis and NMR spectroscopy for conjugation analysis.
  • X-ray diffraction (XRD), small-angle X-ray scattering (SAXS), atomic force microscopy (AFM), and transmission electron microscopy (TEM) for structural characterization.

Main Results:

  • Achieved soluble polymers with exceptionally high degrees of polymerization.
  • Confirmed σ,π-conjugation through silylene-phenylene linkers and Ge=Ge bonds.
  • Observed formation of ladder-like cylindrical assemblies driven by intermolecular dispersion interactions.
  • Thin films showed lamellar ordering of polymer bundles.

Conclusions:

  • Successfully synthesized soluble, high molecular weight conjugated polymers containing Ge=Ge bonds.
  • Demonstrated the potential for creating ordered supramolecular structures from these polymers.
  • Opened new avenues for exploring heavier p-block elements in conjugated polymer design.