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One-step synthesis and XPS investigations of chiral NHC–Au(0)/Au(I) nanoparticles

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Abstract

Although N-heterocyclic carbenes (NHCs) have been demonstrated as suitable ligands for the stabilisation of gold nanoparticles (AuNPs) through a variety of methods, the manner in which such AuNPs form is yet to be fully elucidated. We report a simple and fast one-step synthesis of uniform chiral (L/D)-histidin-2-ylidene stabilised gold nanoparticles using the organometallic Au(I) complex as a well defined starting material. The resulting nanoparticles have an average size of 2.35 ± 0.43 nm for the L analog whereas an average size of 2.25 ± 0.39 nm was found for the D analog. X-ray photoelectron spectroscopy analyses reveal the presence of Au(I) and Au(0) in all NHC stabilised AuNPs. In contrast, measured X-ray photoelectron spectra of dodecanethiol protected gold nanoparticles showed only the presence of a Au(0) species. This observation leads us to postulate that AuNPs synthesised from organometallic NHC–Au(I) complexes exhibit a monolayer of Au(I) surrounding a Au(0) core. This work highlights the importance of synthetic method choice for NHC-stabilized AuNPs, as this could determine Au oxidation states and resulting AuNP properties such as catalytic activities and stabilities.

Graphical abstract: One-step synthesis and XPS investigations of chiral NHC–Au(0)/Au(i) nanoparticles

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Publication details

The article was received on 28 Jan 2019, accepted on 07 Apr 2019 and first published on 08 Apr 2019


Article type: Paper
DOI: 10.1039/C9NR00905A
Citation: Nanoscale, 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    One-step synthesis and XPS investigations of chiral NHC–Au(0)/Au(I) nanoparticles

    A. J. Young, M. Sauer, G. M. D. M. Rubio, A. Sato, A. Foelske, C. J. Serpell, J. M. Chin and M. R. Reithofer, Nanoscale, 2019, Advance Article , DOI: 10.1039/C9NR00905A

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