The structure and binding mode of citrate in the stabilization of gold nanoparticles

Autor: Lyndon Emsley, Hind Al-Johani, Luigi Cavallo, Abdesslem Jedidi, Michael J. Kelly, Jean-Marie Basset, David Gajan, Andrei Gurinov, Samy Ould-Chikh, Mohamed N. Hedhili, Jasmine Viger-Gravel, Shiv Shankar Sangaru, Edy Abou-Hamad, Cory M. Widdifield, Dalaver H. Anjum, Mohamad El Eter
Přispěvatelé: KAUST Catalysis Center (KCC), King Abdullah University of Sciences & Technologie, Chem Dept, University of Tabuk, Dept Chem, King Abdulaziz University, Department of Chemistry, Durham University, Institut des sciences et ingénierie chimiques (ISIC), Ecole Polytechnique Fédérale de Lausanne (EPFL), Solid-State NMR Methods for Materials - Méthodes de RMN à l'état solide pour les matériaux, Institut des Sciences Analytiques (ISA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Imaging & Characterizat Lab, King Abdullah University of Science and Technology (KAUST), This work received support from the King Abdullah University of Science and Technology (KAUST) and ERC Advanced Grant No. 320860., European Project: 320860,EC:FP7:ERC,ERC-2012-ADG_20120216,HI-SENS(2013), Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 2016
Předmět:
Zdroj: Nature Chemistry
Nature Chemistry, 2017, 9 (9), pp.890-895. ⟨10.1038/NCHEM.2752⟩
Nature Chemistry, Nature Publishing Group, 2017, 9 (9), pp.890-895. ⟨10.1038/NCHEM.2752⟩
ISSN: 1755-4349
1755-4330
DOI: 10.1038/NCHEM.2752⟩
Popis: For computer time, this research used the resources of the Supercomputing Laboratory at King Abdullah University of Science & Technology (KAUST) in Thuwal, Saudi Arabia.; International audience; Elucidating the binding mode of carboxylate-containing ligands to gold nanoparticles (AuNPs) is crucial to understand their stabilizing role. A detailed picture of the three-dimensional structure and coordination modes of citrate, acetate, succinate and glutarate to AuNPs is obtained by C-13 and Na-23 solid-state NMR in combination with computational modelling and electron microscopy. The binding between the carboxylates and the AuNP surface is found to occur in three different modes. These three modes are simultaneously present at low citrate to gold ratios, while a monocarboxylate monodentate (1 kappa O-1) mode is favoured at high citrate: gold ratios. The surface AuNP atoms are found to be predominantly in the zero oxidation state after citrate coordination, although trace amounts of Au delta+ are observed. Na-23 NMR experiments show that Na+ ions are present near the gold surface, indicating that carboxylate binding occurs as a 2e(-) L-type interaction for each oxygen atom involved. This approach has broad potential to probe the binding of a variety of ligands to metal nanoparticles.
Databáze: OpenAIRE
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