Gold nanoparticles supported on functionalized silica as catalysts for alkyne hydroamination: A chemico-physical insight

Parise, Chiara; Ballarin, Barbara; Barreca, Davide; Cassani, Maria Cristina; Dambruoso, Paolo; Nanni, Daniele; Ragazzini, Ilaria; Boanini, Elisa

doi:10.1016/j.apsusc.2019.05.192

Cited by 15 publications

(9 citation statements)

References 47 publications

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“…19,26 Besides, three sharp diffraction peaks along the (111), (200), and (220) planes at 38.18, 44.4, and 64.58 correspond to gold (JCPDS 04-0784). 27,28 This result clearly reveals the efficient piezo-photocatalytic reduction of DR-MoS 2 -4 NFs to Au(I) and the formation of gold.…”

Section: E 2gmentioning

confidence: 69%

“…XRD is employed to further investigate the crystal structure of DR-MoS 2 -4 NFs after gold reduction, and the result is shown in Figure b. Three diffraction peaks are detected at 13.87, 33.14, and 58.59°, which can be assigned to 2H-MoS 2 (JCPDS 73-1508). , Besides, three sharp diffraction peaks along the (111), (200), and (220) planes at 38.18, 44.4, and 64.58 correspond to gold (JCPDS 04-0784). , This result clearly reveals the efficient piezo-photocatalytic reduction of DR-MoS 2 -4 NFs to Au(I) and the formation of gold.…”

Section: Resultsmentioning

confidence: 99%

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Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS₂ Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution

Chen

Liang

et al. 2020

ACS Sustainable Chem. Eng.

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To achieve a more efficient gold recovery from a thiosulfate solution, piezo-photocatalytic reduction of Au(I) with defect-rich MoS 2 nanoflowers (DR-MoS 2 NFs) as a catalyst was proposed in this work. Superior piezoelectric response of DR-MoS 2 is detected by a piezoresponse force microscopy (PFM) measurement, revealing the excellent spontaneous polarization of DR-MoS 2 under an external force. Ultrafast Au(I) reduction is realized by DR-MoS 2 NFs with the aid of ultrasonic treatment under indoor light, which is attributed to the decline of the Schottky barrier in the Au/MoS 2 interface and the quick separation of photogenerated carriers induced by the piezoelectric potential. Furthermore, the edge sites and S defects of MoS 2 are directly proven to be the active sites for Au(I) reduction through the transmission electron microscopy (TEM) measurement, while the edge sites play a dominant role. This work may promote the development of piezo-photocatalysis and facilitate the substitution of environmentally friendly thiosulfate leaching to cyanidation.

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Section: E 2gmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS₂ Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution

Chen

Liang

et al. 2020

ACS Sustainable Chem. Eng.

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“…Alkyne hydroamination is also the hydrofunctionalization reaction that has been chiefly investigated in the context of catalysis by Au metal nanoparticles. Catalytic efficiency has been demonstrated at high temperature (80-100 • C) and with standard, reactive substrates such as phenylacetylene and aniline derivatives [26,27]; aliphatic amines and internal alkynes were found to be unreactive, and catalyst deactivation was also observed because of the deposition of alkyne oligomers on the surface of the gold nanoparticles [92]. On the other hand, it has been also demonstrated that the catalyst can be photoactivated, when, for example, the Au nanoparticles are deposited on a photoactive oxide material such as TiO 2 [93].…”

Section: Effect Of the Gold Oxidation Statementioning

confidence: 99%

Gold-Catalyzed Intermolecular Alkyne Hydrofunctionalizations—Mechanistic Insights

2020

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An overview of the current state of mechanistic understanding of gold-catalyzed intermolecular alkyne hydrofunctionalization reactions is presented. Moving from the analysis of the main features of the by-now-generally accepted reaction mechanism, studies and evidences pointing out the mechanistic peculiarities of these reactions using different nucleophiles HNu that add to the alkyne triple bond are presented and discussed. The effects of the nature of the employed alkyne substrate and of the gold catalyst (employed ligands, counteranions, gold oxidation state), of additional additives and of the reaction conditions are also considered. Aim of this work is to provide the reader with a detailed mechanistic knowledge of this important reaction class, which will be invaluable for rapidly developing and optimizing synthetic protocols involving a gold-catalyzed alkyne hydrofunctionalization as a reaction step.

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“…31,32 Importantly, surface-immobilized organic ligands can also affect the catalytic properties of supported nanoparticles in a similar way in which organic ligands control the reactivity of homogeneous catalysts via electronic or steric effects. [33][34][35][36][37][38][39][40][41][42][43] For instance, electron-donating ligands can increase the electron density of nanoparticles and modify their work function, 44 to ultimately affect their electrochemical potential in redox processes. Herein, we explored the effect of silicagrafted organic ligands on the selective aerobic oxidation of amines to amides catalysed by supported Au nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Surface ligands enhance the catalytic activity of supported Au nanoparticles for the aerobic α-oxidation of amines to amides

Chatterjee

Wang

Manzano

et al. 2022

Catal. Sci. Technol.

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Gold nanoparticles supported on functionalized silica as catalysts for alkyne hydroamination: A chemico-physical insight

Cited by 15 publications

References 47 publications

Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS₂ Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution

Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS₂ Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution

Gold-Catalyzed Intermolecular Alkyne Hydrofunctionalizations—Mechanistic Insights

Surface ligands enhance the catalytic activity of supported Au nanoparticles for the aerobic α-oxidation of amines to amides

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Gold nanoparticles supported on functionalized silica as catalysts for alkyne hydroamination: A chemico-physical insight

Cited by 15 publications

References 47 publications

Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS2 Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution

Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS2 Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution

Gold-Catalyzed Intermolecular Alkyne Hydrofunctionalizations—Mechanistic Insights

Surface ligands enhance the catalytic activity of supported Au nanoparticles for the aerobic α-oxidation of amines to amides

Contact Info

Product

Resources

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Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS₂ Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution

Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS₂ Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution