Synthesis of goldene comprising single-atom layer gold

Nature Synthesis, Journal Year: 2024, Volume and Issue: 3(6), P. 744 - 751

Published: April 16, 2024

Abstract The synthesis of monolayer gold has so far been limited to free-standing several-atoms-thick layers, or monolayers confined on inside templates. Here we report the exfoliation single-atom-thick achieved through wet-chemically etching away Ti 3 C 2 from nanolaminated AuC , initially formed by substituting Si in SiC with Au. is a renown MAX phase, where M transition metal, A group element, and X N. Our developed synthetic route facile, scalable hydrofluoric acid-free method. two-dimensional layers are termed goldene. Goldene roughly 9% lattice contraction compared bulk observed electron microscopy. While ab initio molecular dynamics simulations show that goldene inherently stable, experiments some curling agglomeration, which can be mitigated surfactants. X-ray photoelectron spectroscopy reveals an Au 4 f binding energy increase 0.88 eV. Prospects for preparing other non-van der Waals Au-intercalated phases, including developing schemes, presented.

Language: Английский

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Deoxygenative Silylation of C(sp³)–O Bonds with Hydrosilane by Cooperative Catalysis of Gold Nanoparticles and Solid Acids

ACS Catalysis, Journal Year: 2023, Volume and Issue: 13(10), P. 6787 - 6794

Published: May 3, 2023

Efficient deoxygenative silylation of C(sp3)–O bonds with hydrosilanes by supported Au catalysts is described. Gold nanoparticles on TiO2 enabled various to be used as sources silyl groups in C–Si cross-coupling reactions. A variety alkyl acetates and propargyl carbonates participated the Au-catalyzed reactions furnish corresponding allenylsilanes high yields. In addition, Au/TiO2 was also effective for ring-opening cyclic ethers. detailed mechanistic investigation corroborated that title reaction involves formation radical intermediates, cooperation single-electron transfer Lewis acid sites at surface metal oxides responsible unusual reactivity specific C(sp3)–Si bond formation.

Language: Английский

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Borylation of Stable C(sp³)–O Bonds of Alkyl Esters over Supported Au Catalysts

Organic Letters, Journal Year: 2024, Volume and Issue: 26(15), P. 2902 - 2907

Published: April 4, 2024

We report herein that supported gold catalysts efficiently promote the borylation of stable C(sp3)–O bonds alkyl esters. The use a disilane as an electron source and nanoparticles single-electron transfer catalyst is key to generating radicals via homolysis bonds, thereby enabling cross-coupling between bis(pinacolato)diboron linear cyclic esters afford diverse boronates.

Language: Английский

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Pt(II) complexes bearing P,N-donor ligands as catalysts in chemoselective hydrosilylation, hydrogermylation, and hydroboration of terminal alkenes

Journal of Catalysis, Journal Year: 2024, Volume and Issue: 433, P. 115494 - 115494

Published: April 10, 2024

Language: Английский

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Axial Ligand Enables Synthesis of Allenylsilane through Dirhodium(II) Catalysis

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(38)

Published: June 18, 2024

Described herein is a dirhodium(II)-catalyzed silylation of propargyl esters with hydrosilanes, using tertiary amines as axial ligands. By adopting this strategy, range versatile and useful allenylsilanes can be achieved good yields. This reaction not only represents S

Language: Английский

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Nickel-catalyzed cross-electrophile C-Ge coupling of benzyl pivalates and chlorogermanes

Science China Chemistry, Journal Year: 2023, Volume and Issue: 66(12), P. 3562 - 3566

Published: Sept. 11, 2023

Language: Английский

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Optimization of Metal–Support Cooperation for Boosting the Performance of Supported Gold Catalysts for the Borylation of C–O and C–N Bonds

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(40), P. 27528 - 27541

Published: Aug. 29, 2024

The cooperation of multiple catalytic components is a powerful tool for intermolecular bond formation, specifically, cross-coupling reactions. Supported metal catalysts have interfacial sites between nanoparticles and their supports where elements can work in to efficiently promote Hence, the establishment novel guidelines designing active supported indispensable heterogeneous which enable efficient In this article, we performed kinetic theoretical studies elucidate effect metal-support borylation C-O bonds by gold revealed that Lewis acid density determined number at (NPs) surface cooperation. Furthermore, DFT calculations strong adsorption diborons interface Au NPs decrease LUMO level adsorbed diboron were responsible borylation. with optimized metal-metal oxide sites, namely, Au/α-Fe

Language: Английский

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Conversion of Polypropylene to Light Olefins by HMFI Catalysts below Pyrolytic Temperature: Catalytic, Spectroscopic, and Theoretical Studies

The Journal of Physical Chemistry C, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

Plastic waste is a major environmental issue; converting it directly into valuable chemicals by using catalysts promising alternative to plastic recycling. Here, we report the selective catalytic cracking of polypropylene (PP), typical commodity plastic, high-value light olefins (C2–C5), below pyrolytic temperature (290 °C) and without external hydrogen supply, zeolite catalysts. Among H+-form zeolites with different structures, HMFI showed highest yields hydrocarbons which (C2–C5) were products. The HMFI-catalyzed PP conversion was applicable upcycling model waste, resulting in 61.9% hydrocarbon yield. results situ IR experiments small amount Brønsted acid sites suggested that on surface are indispensable for posited be active short-chain (oligomeric) species as intermediate Density functional theory analyses conducted determine plausible reaction pathways adopting 2,4-dimethylheptene shortest unit oligomeric species. obtained show β-scission isobutene propylene (or propyl alkoxide group) via carbocation intermediates an activation energy 118 kJ mol–1. Operando UV–vis under conditions, combined ex 1H NMR 13C spent catalyst, some further converted or heavy aromatics (coke deposit), probably carbenium ion

Language: Английский

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Formal Transesterification Reaction of But-3-enyl Esters Enabled by a Synergistic Nickel/Zinc Relay

Organic Letters, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 27, 2025

The transition metal-catalyzed coupling reaction has renewed the role of ester as an electrophilic partner. In this context, we describe a synergistic Ni/Zn-catalyzed formal transesterification but-3-enyl esters with tetrahydrofuran and alkyl iodides to give 4-alkoxylbutyl esters. aromatic aliphatic are both competent electrophiles thus broaden substrate scope in reactions, because previously reported work were strictly limited ones. Mechanistic studies reveal that C(acyl)-O bond or even more inert C(alkyl)-O could be cleaved under nickel catalysis. Two catalytic cycles proposed, which represent new pathway versus traditional transesterification.

Language: Английский

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Hydrosilylation or Dehydrogenative Silylation Pathways via the Au-Catalyzed Activation of Hydrosilanes

Journal of Organometallic Chemistry, Journal Year: 2025, Volume and Issue: unknown, P. 123546 - 123546

Published: Jan. 1, 2025

Language: Английский

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