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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Pd2Au36(SR)24 cluster: structure studies.

Bei Zhang1, Sameh Kaziz, Houhua Li

  • 1Department of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland. noe.barrabes@gmail.com.

Nanoscale
|September 30, 2015
PubMed
Summary

This study investigates palladium atom locations in Pd2Au36(SC2H4Ph)24 nanoparticles using experimental and theoretical methods. Results confirm palladium-sulfur bonds and oxidized palladium atoms within the nanoparticle structure.

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Area of Science:

  • Nanoparticle characterization
  • Materials science
  • Surface chemistry

Background:

  • Understanding the precise atomic arrangement in metal nanoclusters is crucial for their catalytic and electronic properties.
  • Palladium-gold alloy nanoclusters with organic ligands are of interest for various applications.

Purpose of the Study:

  • To determine the exact location of palladium (Pd) atoms within the Pd2Au36(SC2H4Ph)24 nanocluster.
  • To elucidate the bonding environment of palladium atoms.

Main Methods:

  • X-ray photoelectron spectroscopy (XPS) for elemental and oxidation state analysis.
  • Palladium K-edge extended X-ray absorption fine-structure (EXAFS) spectroscopy for local atomic structure determination.
  • Far infrared spectroscopy for vibrational mode analysis.
  • Theoretical calculations for spectral simulations and structural modeling.

Main Results:

  • XPS data revealed the presence of oxidized palladium species.
  • EXAFS spectroscopy provided clear evidence for palladium-sulfur (Pd-S) bonds.
  • Experimental spectra were consistent with theoretical simulations of staple, surface, and core-doped structures.

Conclusions:

  • The study successfully located palladium atoms within the Pd2Au36(SC2H4Ph)24 nanocluster.
  • Palladium atoms are bonded to sulfur atoms, indicating a specific interaction with the organic ligands.
  • Combined experimental and theoretical approaches provide a comprehensive understanding of the nanocluster's structure.