Communication Dans Un Congrès Année : 2024

Mesoionic carbenes (MIC), a versatile type of N-heterocyclic carbens (NHC) for the stabilization of gold nanoparticles (Invited)

Résumé

In the last decade, N-heterocyclic carbenes (NHC) have gain interest as highly efficient surface ligands for metal nanoparticles and surfaces. Their main advantage is likely their capability to form strong M-C bonds, which result in a high stability in harsh conditions. Actually, in several reports, NHC have been shown to perform better than thiols, the ligands classically used to stabilize gold nanoparticles. More recently, mesoionic carbenes (MICs), which are based on the 1,2,3-triazol-5-ylidene scaffold, have also been reported to stabilize gold nanoparticles. Compared to classical NHC based on the 1,3-imidazol-2-ylidene scaffold (ImNHC), MICs offer an easier multifunctionalization. Indeed, their synthesis, which relies on the versatile copper-catalyzed alkyne-azide click (CuAAC) reaction followed by the quaternarization of N3, allows one to introduce three different substituents on a single MIC core. Moreover, MICs are known to be stronger sigma-donors than ImNHC, which should provide a better anchoring to the surface atoms. MICs stabilized gold nanoparticles can be easily prepared through a simple and straightforward one-pot protocol, starting directly from triazolium salts and a separated Au(III) source. Changing the counter ion associated to the triazolium as well as the triazolium to Au(III) ratio enable to modulate the nanoparticles size from 3 to 9 nm. The presence of MICs at the surface of purified nanoparticles can be confirmed by a combination of solid-state NMR and XPS. These nanoparticles exhibit a high stability with respect to temperature and the presence of exogenous thiols. Their suspensions can also be used for catalysis.
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Dates et versions

hal-04895171 , version 1 (17-01-2025)

Identifiants

  • HAL Id : hal-04895171 , version 1

Citer

François Ribot. Mesoionic carbenes (MIC), a versatile type of N-heterocyclic carbens (NHC) for the stabilization of gold nanoparticles (Invited). ACS Spring 2024 – Next-Generation Surface Functionalization Strategies for Noble-Metal Surfaces and Nanoparticles: From Fundamentals to Applications (COLL), Mar 2024, New Orleans (LA), United States. ⟨hal-04895171⟩
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