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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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Alkyne-Functionalized Platinum Chalcogenide (S, Se) Nanoparticles.

Qiming Liu1, Xingjian Song1, Davida DuBois1

  • 1Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, United States.

Inorganic Chemistry
|January 3, 2024
PubMed
Summary

Researchers developed a new method to create stable platinum chalcogenide nanoparticles using conjugated acetylene ligands. This enhances electronic interactions between the nanoparticle core and ligands for improved performance in various applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Inorganic Chemistry

Background:

  • Metal chalcogenide nanoparticles are crucial for many applications.
  • Current stabilization methods using organic ligands with thiol, amine, or carboxyl groups limit electronic interactions at the interface.
  • This limitation hinders the full potential of these nanomaterials.

Purpose of the Study:

  • To develop a facile wet-chemistry method for preparing stable platinum chalcogenide nanoparticles.
  • To introduce conjugated acetylene derivatives as capping ligands.
  • To investigate the impact of conjugated interfaces on electronic interactions.

Main Methods:

  • Synthesis of platinum chalcogenide (S, Se) nanoparticles using a wet-chemistry approach.
  • Capping the nanoparticles with acetylene derivatives, such as 4-ethylphenylacetylene (EPA).
  • Characterization using optical and X-ray spectroscopic measurements, and density functional theory (DFT) calculations.

Main Results:

  • Stable platinum chalcogenide nanoparticles capped with acetylene derivatives were successfully prepared.
  • Formation of conjugated Pt-C≡ bonds at the nanoparticle-ligand interface was confirmed.
  • Enhanced electronic interactions between the platinum core's d electrons and the acetylene's π electrons were observed.
  • These interactions are significantly stronger compared to nonconjugated Pt-S bonds in mercapto-capped nanoparticles.

Conclusions:

  • Conjugated anchoring linkages are significant for stabilizing and functionalizing metal chalcogenides.
  • The developed strategy offers a unique approach to enhance electronic coupling in nanoparticle systems.
  • This method holds promise for advancing diverse applications of metal chalcogenide nanoparticles.