Selective oxidation of methane into formaldehyde and carbon monoxide catalyzed by supported thermally stable iron oxide subnanoclusters prepared from a diiron-introduced polyoxometalate precursor

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 314, P. 121420 - 121420

Published: May 20, 2022

Language: Английский

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Structure, optical properties, and catalytic applications of alkynyl-protected M₄Rh₂(M = Ag/Au) nanoclusters with atomic precision: a comparative study

Dalton Transactions, Journal Year: 2023, Volume and Issue: 52(27), P. 9441 - 9447

Published: Jan. 1, 2023

We report two atomically precise alloy nanoclusters of Ag4Rh2(CCArF)8(PPh3)2 and Au4Rh2(CCArF)8(PPh3)2 (Ar = 3,5-(CF3)2C6H3, abbreviated as Ag4Rh2 Au4Rh2, respectively) co-protected by alkynyl phosphine ligands. Both clusters have identical octahedral metal core configurations can be termed superatoms with free electrons. However, they possess different optical features, manifested totally absorbance peaks, drastically emission also, has a much higher fluorescence quantum yield (18.43%) than Au4Rh2 (4.98%). Moreover, exhibited markedly superior catalytic performance in the electrochemical hydrogen evolution reaction (HER), lower overpotential at 10 mA cm-2 better stability. Density functional theory (DFT) calculations revealed that energy change for adsorption H* (0.64 eV) is one (-0.90 after stripping single ligand from cluster. In contrast, demonstrated stronger capability catalyzing 4-nitrophenol reduction. The present study provides an exquisite example to understand structure-property relationship nanoclusters, emphasizes importance fine-tuning physicochemical properties through modulating beyond.

Language: Английский

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Cu₆₆ nanoclusters from hierarchical square motifs: Synthesis, assembly, and catalysis

Aggregate, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 22, 2024

Abstract The elucidation of hierarchical assembly structure metal nanoclusters is fundamental importance in the context bottom‐up fabrication and functionalization. While recent studies have provided valuable insights into multiscale patterns gold or silver‐based nanoclusters, success achieving similar results for copper analogues has been notably limited. Herein, by virtue a slow‐ligand‐release strategy, nanocluster denoted as [Cu 66 Cl 8 (PPh 3 ) (SC 2 H 5 32 24 ](SbF 6 was synthesized, resulting formation fresh structures one‐pot. arrangement atoms within cluster reveals an orderly 16 Cu 4 squares, representing rare comprising square motifs. Additionally, ligands (phosphine, thiolate, halide) coordinate to surface regiospecific manner, displaying well. self‐assembly facilitated C‐H···F interaction between moieties SbF − anions further induces three‐dimensional cubes eventually large nanocrystals. Density functional theoretical (DFT) calculations reveal that hydride with low chemical shifts typically exhibit short Cu‐H distances. demonstrates moderate stability high catalytic activity chemoselective hydrogenation cyclohexanone under mild conditions.

Language: Английский

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Self-assembly of three Ag-polyoxovanadates frameworks for their efficient construction of C N bond and detoxification of simulant sulfur mustard

Chinese Chemical Letters, Journal Year: 2021, Volume and Issue: 33(5), P. 2605 - 2610

Published: Sept. 16, 2021

Language: Английский

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Switchable photon and phonon emission properties of an atomically precise Ag₁₄core-based two-dimensional silver cluster-assembled material

Materials Chemistry Frontiers, Journal Year: 2021, Volume and Issue: 5(24), P. 8380 - 8386

Published: Jan. 1, 2021

Changes in structural architecture via interlayer C–H⋯F interactions triggered by solvent molecules influence the dual (photon and phonon) emission mechanism of a two-dimensional cluster-assembled material, [Ag 14 (S t Bu) 10 (CF 3 COO) 4 (4,4′-azopyridine) 2 ].

Language: Английский

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