2026-04-13T04:11:23Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/228542024-06-18T13:58:05Zcom_2072_452955com_2072_2054col_2072_453073

Novel NHC-Based Au(I) Complexes as Precursors of Highly Pure Au(0) Nuggets under Oxidative Conditions Font Rubio, Pau Tzouras, Nikolaos V. Papastavrou, Argyro T. Vougioukalakis, Georgios C. Ribas Salamaña, Xavi Catàlisi Catalysis Catalitzadors Catalysts Reaccions d'addició Addition reactions Reaccions químiques Chemical reactions 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 The research project was supported by MINECO-Spain, PID2019-104498GB-I00 to X.R., as well as by the Hellenic Foundation for Research and Innovation (H.F.R.I.) under the “1st Call for H.F.R.I. Research Projects to support Faculty Members & Researchers and the procurement of high-cost research equipment grant” (Project Number: 16) 2024-06-18T13:58:05Z 2024-06-18T13:58:05Z 2024-06-18T13:58:05Z 2023-03-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion peer-reviewed http://hdl.handle.net/10256/22854 info:eu-repo/semantics/altIdentifier/doi/10.3390/molecules28052302 info:eu-repo/semantics/altIdentifier/eissn/1420-3049 PID2019-104498GB-I00 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-104498GB-I00/ES/NANOCAPSULAS COMO PLATAFORMAS SUPRAMOLECULARES PARA LA FUNCIONALIZACION REGIOSELECTIVA DE FULLERENOS Y CATALISIS EN EL ESPACIO CONFINADO/ Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess MDPI (Multidisciplinary Digital Publishing Institute) Molecules, 2023, vol. 28, núm. 5, p. 2302 Articles publicats (D-Q)