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Novel NHC-Based Au Nuggets under Oxidative Conditions

Molecules (Basel, Switzerland), 2023-03, Vol.28 (5) [Peer Reviewed Journal]

COPYRIGHT 2023 MDPI AG ;ISSN: 1420-3049 ;EISSN: 1420-3049 ;DOI: 10.3390/molecules28052302

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  • Title:
    Novel NHC-Based Au Nuggets under Oxidative Conditions
  • Author: Font, Pau ; Tzouras, Nikolaos V ; Papastavrou, Argyro T ; Vougioukalakis, Georgios C ; Ribas, Xavi
  • Subjects: Catalysis ; Chemical properties ; Jewelry
  • Is Part Of: Molecules (Basel, Switzerland), 2023-03, Vol.28 (5)
  • Description: The Lewis-acidic character and robustness of NHC-Au(I) complexes enable them to catalyze a large number of reactions, and they are enthroned as the catalysts of choice for many transformations among polyunsaturated substrates. More recently, Au(I)/Au(III) catalysis has been explored either by utilizing external oxidants or by seeking oxidative addition processes with catalysts featuring pendant coordinating groups. Herein, we describe the synthesis and characterization of N-heterocyclic carbene (NHC)-based Au(I) complexes, with and without pendant coordinating groups, and their reactivity in the presence of different oxidants. We demonstrate that when using iodosylbenzene-type oxidants, the NHC ligand undergoes oxidation to afford the corresponding NHC=O azolone products concomitantly with quantitative gold recovery in the form of Au(0) nuggets ~0.5 mm in size. The latter were characterized by SEM and EDX-SEM showing purities above 90%. This study shows that NHC-Au complexes can follow decomposition pathways under certain experimental conditions, thus challenging the believed robustness of the NHC-Au bond and providing a novel methodology to produce Au(0) nuggets.
  • Publisher: MDPI AG
  • Language: English
  • Identifier: ISSN: 1420-3049
    EISSN: 1420-3049
    DOI: 10.3390/molecules28052302
  • Source: Open Access: DOAJ Directory of Open Access Journals
    Open Access: PubMed Central
    Geneva Foundation Free Medical Journals at publisher websites
    AUTh Library subscriptions: ProQuest Central
    Alma/SFX Local Collection
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