2026-04-13T01:16:31Zhttps://recercat.cat/oai/request

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

00925njm 22002777a 4500 dc Font Rubio, Pau author Tzouras, Nikolaos V. author Papastavrou, Argyro T. author Vougioukalakis, Georgios C. author Ribas Salamaña, Xavi author 2023-03-01 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) http://hdl.handle.net/10256/22854 Catàlisi Catalysis Catalitzadors Catalysts Reaccions d'addició Addition reactions Reaccions químiques Chemical reactions Novel NHC-Based Au(I) Complexes as Precursors of Highly Pure Au(0) Nuggets under Oxidative Conditions