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Synthesis and Characterization of Amphiphilic Gold Nanoparticles
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Density functional theory approach to gold-ligand interactions: separating true effects from artifacts.

Jessica V Koppen1, Michał Hapka2, Marcin Modrzejewski2

  • 1Department of Chemistry, Oakland University, Rochester, Michigan 48309, USA.

The Journal of Chemical Physics
|July 3, 2014
PubMed
Summary

This study introduces a reliable computational method for gold-ligand interactions using density functional theory (DFT). The new approach accurately predicts binding energies, overcoming limitations of traditional DFT methods.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Materials Science

Background:

  • Donor-acceptor interactions are challenging for conventional Density Functional Theory (DFT).
  • Accurate prediction of gold-ligand interactions requires precise calculation of electron donor and acceptor properties.

Purpose of the Study:

  • To develop a reliable DFT approach for donor-acceptor type gold-ligand interactions.
  • To accurately compute binding energies for gold complexes with various ligands.

Main Methods:

  • Utilized the Generalized Kohn Sham framework with tuned range-separated functionals.
  • Employed a two-parameter tuning scheme for monomer properties to find a common optimal functional.
  • Incorporated dispersion contributions for enhanced accuracy.
  • Validated the approach using water dimer and aurophilic complex.

Main Results:

  • Successfully computed binding energies for Au4 with ligands like SCN(-), benzenethiol, and pyridine.
  • Achieved agreement with coupled-cluster reference values, indicating high reliability.
  • Demonstrated the effectiveness of the two-parameter tuning for donor-acceptor systems.

Conclusions:

  • The developed DFT method provides a reliable treatment for donor-acceptor gold-ligand interactions.
  • This approach accurately captures ionization potentials and electron affinities crucial for these interactions.
  • The findings offer a robust computational tool for studying gold-based materials and catalysts.