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Electron transfer through 3D monolayers on Au25 clusters.

Sabrina Antonello1, Giorgio Arrigoni, Tiziano Dainese

  • 1Department of Chemistry, and §IENI-CNR c/o Department of Chemistry, University of Padova , via Marzolo 1, 35131 Padova, Italy , and ‡Department of Biomedical Sciences, University of Padova, Viale G. Colombo 3, 35121 Padova, Italy.

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Summary

Monolayer-protected clusters (MPCs) on gold nanoparticles exhibit a critical ligand length. Shorter ligands create fluid monolayers, while longer chains form bundles, enabling electronic communication with the gold core.

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Area of Science:

  • Nanotechnology
  • Surface Chemistry
  • Materials Science

Background:

  • Monolayer-protected clusters (MPCs) are 3D analogues of 2D self-assembled monolayers (SAMs) on gold surfaces.
  • Despite their importance in catalysis and nanomedicine, the solution structure of 3D SAMs on gold nanoparticles remains poorly understood.

Purpose of the Study:

  • To investigate the structural transition and electronic properties of monolayer-protected gold nanoparticles with varying ligand lengths.
  • To understand how ligand structure influences electronic communication between the gold core and the surrounding environment.

Main Methods:

  • Synthesis of monodisperse Au25(SCnH2n+1)18 clusters with varying alkyl chain lengths (n=2-18).
  • Electron transfer studies to probe monolayer properties.
  • 1H NMR spectroscopy, IR absorption spectroscopy, and molecular dynamics simulations to support findings.

Main Results:

  • A critical ligand length was identified, distinguishing between fluid monolayer structures (short ligands) and self-organized bundles (long ligands).
  • Efficient electronic communication between the Au25 core and the environment is possible even with long alkyl chains, unlike traditional 2D SAMs.
  • Ligand length significantly impacts the monolayer structure and electronic properties of gold clusters.

Conclusions:

  • The structure of 3D SAMs on gold nanoparticles is more dynamic than previously assumed.
  • Ultrasmall gold cores can maintain electronic communication with their surroundings despite protective monolayers, challenging conventional views.
  • Findings offer new insights into the interfacial properties of gold nanoparticles for applications in catalysis and nanomedicine.