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Synthetically Versatile Nitrogen Acyclic Carbene Stabilized Gold Nanoparticles.

Guilherme M D M Rúbio1, Bernhard K Keppler1, Jia Min Chin2

  • 1Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Strasse 42, 1090, Vienna, Austria.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 30, 2020
PubMed
Summary

N-acyclic carbenes (NACs) offer a versatile alternative to N-heterocyclic carbenes (NHCs) for stabilizing gold nanoparticles. This study presents the first stable, monodisperse NAC-functionalized gold nanoparticles with tunable properties.

Keywords:
N-acyclic carbenesN-heterocyclic carbenesgold nanoparticlesnonsymmetric carbeneswater dispersible nanoparticles

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Organic Chemistry

Background:

  • N-heterocyclic carbenes (NHCs) are effective gold nanoparticle stabilizers due to strong gold-binding affinity.
  • Limited tunability of NHCs arises from synthetic challenges in creating nonsymmetric structures.

Purpose of the Study:

  • To explore N-acyclic carbenes (NACs) as versatile alternatives to NHCs for gold nanoparticle stabilization.
  • To synthesize and characterize the first series of stable, monodisperse NAC-functionalized gold nanoparticles.

Main Methods:

  • Synthesis of NAC-functionalized gold nanoparticles.
  • Characterization using Nuclear Magnetic Resonance (NMR), UV/Vis spectroscopy, and Transmission Electron Microscopy (TEM).
  • Assessment of nanoparticle stability under various conditions (heat, time, presence of thiols).

Main Results:

  • Successful synthesis of stable and monodisperse gold nanoparticles functionalized with NACs.
  • Particles ranged in size from 3.8 to 11.6 nm.
  • Demonstrated excellent stability at elevated temperatures, over extended periods, and in the presence of thiols.

Conclusions:

  • NACs provide a highly tunable and synthetically versatile platform for gold nanoparticle stabilization.
  • NAC-stabilized gold nanoparticles represent a promising alternative to NHC-stabilized counterparts.
  • These findings open new avenues for designing functional nanomaterials with tailored properties.