Generation of Catalytically Active Gold Nanocrystals in Water Induced with Ferrocene Carboxylate. Issue 25 (21st June 2021)

• Record Type: Journal Article
• Authors: Wang, Changlong; Brudo, Agathe; Ducrot, Laurine; Fu, Fangyu; Ruiz, Jaime; Escobar, Ane; Martinez‐Villacorta, Angel; Moya, Sergio; Astruc, Didier
• Is Part Of: European journal of inorganic chemistry. Issue 25(2021)
• Page Start: 2471
• Page End: 2479
• Publication Date: 2021-06-21
• Subjects: Gold nanoparticles -- Ferrocene -- Catalysis -- Nitrophenol reduction -- Ferrocene carboxylate; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.202100244
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract: The fabrication and properties of anisotropic gold nanoparticles (AuNPs) are of great interest from fundamental and application standpoints. Whereas various neutral ferrocene derivatives have been shown to reduce Au III to Au 0 NPs owing to slightly exergonic electron transfer in biphasic systems, the question remained open for water soluble ferrocenes containing electron withdrawing substituents increasing the Fe III /Fe II oxidation potential. Here, it is shown that reaction of sodium ferrocene carboxylate, NaFcCO2, alone, does not reduce H[Au III Cl4 ] to stable AuNPs under ambient conditions in water. On the other hand, reaction between NaFcCO2 and H[Au III Cl4 ] in water in the presence of poly (vinyl pyrrolidone) (PVP), citrate or other 1, 2, 3‐triazole (trz)‐containing stabilizers is shown to produce catalytically active Au nanocrystals with various shapes. EDX results confirm the fixation of the ferrocenyl carboxylate ligand onto the AuNP surface. 4‐nitrophenol reduction to 4‐aminophenol by Na[BH4 ] in water proceeds in the presence of the various stabilizers, without induction time in most cases, which confirms the weakness of the ferrocenyl carboxylate ligand bonded to the AuNP surface and the favorable role of ferrocenyl carboxylate ligand for catalysis at the AuNP surface. Abstract : In the presence of sodium ferrocene carboxylate and a stabilizing ligand (PEG‐2000, PVP, sodium citrate, 2000‐PEG‐tris‐1, 2, 3‐benzyltriazole, triazolyle‐TEG polymer), H[AuCl4 ] was reduced in water to gold nanocrystals that catalyzed 4‐nitrophenol reduction, most often without induction time.