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Related Experiment Videos

Polyalkynes capped by sulfur and selenium.

Daniel B Werz1, Rolf Gleiter

  • 1Organisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany.

The Journal of Organic Chemistry
|November 25, 2003
PubMed
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Researchers synthesized sulfur- and selenium-capped polyalkynes using protected precursors. These novel compounds exhibit significant chalcogen atom interactions, with solid-state studies revealing short intermolecular selenium-selenium bonds.

Area of Science:

  • Organic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Polyalkynes are versatile carbon-rich materials with tunable electronic properties.
  • Chalcogen incorporation into organic frameworks can lead to unique electronic and structural characteristics.
  • Controlled synthesis of functionalized polyalkynes is crucial for advanced material applications.

Purpose of the Study:

  • To synthesize novel sulfur- and selenium-capped polyalkynes.
  • To investigate the electronic interactions between chalcogen atoms in these compounds.
  • To explore the solid-state structure and intermolecular interactions of selenium-capped polyalkynes.

Main Methods:

  • Synthesis of bis(trimethylsilyl)-protected polyalkynes.
  • Deprotection and lithiation using MeLi/LiBr.

Related Experiment Videos

  • Reaction of lithium salts with thiocyanatomethane (for sulfur) and selenium/methyl iodide (for selenium).
  • Spectroscopic analysis (Photoelectron Spectroscopy (PE) and Ultraviolet Spectroscopy (UV)).
  • Quantum chemical calculations.
  • X-ray diffraction for solid-state structure determination.

    • Main Results:

    • Successful synthesis of sulfur- and selenium-capped polyalkynes with varying degrees of unsaturation (two to four triple bonds).
    • Spectroscopic and computational studies confirmed significant electronic interactions between the sulfur or selenium atoms.
    • Solid-state analysis of a representative selenium-capped polyalkyne (3(4)) revealed short intermolecular selenium-selenium contacts.

    Conclusions:

    • Novel sulfur- and selenium-capped polyalkynes have been synthesized and characterized.
    • The presence of chalcogen atoms leads to significant inter-chalcogen electronic interactions.
    • The observed intermolecular Se...Se interactions in the solid state suggest potential for self-assembly and novel material properties.