PdAu Nanosheets for Visible-Light-Driven Suzuki Cross-Coupling Reactions

Abstract

Combining a two-dimensional (2D) morphology and plasmonic photocatalysis represents an efficient design for light-driven organic transformations. We report a one-pot synthesis of surfactant templated PdAu nanosheets (NSs). Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) analyses show the formation of 2D PdAu structures was initiated through nanoparticle seeds dispersed in the alkyl ammonium salt surfactant which acted as a template for the growth into NSs. The PdAu NSs were used for visible-light-enhanced Suzuki cross coupling. The PdAu bimetallic NSs outperformed monometallic Pd NSs and commercial Pd/C in room-temperature Suzuki cross-coupling reactions. The high catalytic activity is attributed to a combination of the 2D morphology giving rise to plasmon-enhanced catalysis and a high density of surface atoms, the electron-rich Pd surface due to alloying, and the presence of weakly bound amines. A comparative study of surfactant-assisted NSs and CO-assisted NSs was also carried out to assess the influence of surface ligands on the catalytic and photocatalytic enhancement of NSs with similar morphology. The surfactant-assisted NSs showed substantially superior performance compared to the CO-assisted for room-temperature Suzuki coupling reactions.

Enhanced Photocatalytic Activity of Surface‐Modified TiO2 with Bimetallic AuPd Nanoalloys for Hydrogen Generation

“…[61][62][63] Bimetallic AuPd nanoalloys have been reported to exhibit negative shifts in both the Au 4f and Pd 3d core levels. [64,65]…”

Plasmonics: A Versatile Toolbox for Heterogeneous Photocatalysis

“…Because of catalyst recovery issues with homogeneous catalysts, efforts have been directed successfully toward the heterogenization of the active species [ 132 ] and, more recently, toward the replacement of heat by light as energy source. Since Pd is a well‐known catalyst for this reaction, it has been associated with plasmonic metals, usually Au, with different reported architectures such as alloyed NPs deposited on ZrO 2 , [ 133 ] Au nanorods decorated by Pd nanocrystals [ 134 ] or, more recently, Au‐Pd nanosheets, [ 135 ] to name a few.…”

Plasmon-Assisted Chemistry Using Chiral Gold Helicoids: Toward Asymmetric Organic Catalysis

“…Consequently, plasmon(s) can induce diverse chemical processes in closed environments through plasmon heating, the excitation of inner molecular electron(s), and the injection of hot electrons . Plasmon catalysis has been implemented in various organic transformations. − Despite the frequent use of metal nanoparticles as (photo)­catalysts, one of the basic trends in organic chemistry, particularly asymmetric catalysis, remains almost unexplored …”