Bimetallic Ag–Cu alloy nanoparticles as a highly active catalyst for the enamination of 1,3-dicarbonyl compounds

Rout, Lipeeka; Kumar, Aniket; Dhaka, R. S.; Dash, Priyabrat

doi:10.1039/c6ra04569c

Cited by 55 publications

(44 citation statements)

References 91 publications

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“… Scheme summarizing different classes of multi‐metallic nanostructures as well as corresponding examples of laser‐generated nanomaterials. In the 3 rd row TEM‐EDX pictures are shown for AgAu (fundamentals), NiMo (electrocatalysis), PtCo (electrocatalysis), AuFe (fundamentals [58] , reduction reactions), AgCu (fundamentals [202] , enamination reaction) and PtCuCo (electrocatalysis). TEM‐EDX picture of AgAu adapted with permission from Ref.…”

Section: Laser‐based Materials Design: Multi‐elemental Nanoparticlesmentioning

confidence: 99%

“…[213] Consequently, for 3 particles observed in this study, the authors found a low number of carbon shells in case of smaller nanoparticles, and vice versa. [213] Recently, this correlation was [61] (fundamentals), NiMo [32] (electrocatalysis), PtCo [192] (electrocatalysis), AuFe [58] (fundamentals [58] , reduction reactions [207] ), AgCu [202] (fundamentals [202] , enamination reaction [208] ) and PtCuCo [205] (electrocatalysis). TEM-EDX picture of AgAu adapted with permission from Ref.…”

Section: Carbon-covered Core-shell Nanostructuresmentioning

confidence: 99%

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Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

et al. 2019

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Due to material gaps and synthesis‐related cross‐correlations in heterogeneous catalysis, chemists and physicists are constantly motivated to develop novel catalyst preparation methods for independent control of morphology, size, and composition. Within this article, advances, opportunities, and the current limits of laser‐based catalyst preparation technique, as well as synergies with conventional methods will be reviewed in terms of purity, particle size, morphology, composition, and nanoparticle‐support interaction. It will be shown, that the surfactant‐free particles represent ideal model materials to validate kinetic models and conduct parametric activity studies by independent adjustment of functional properties like nanoparticle size, composition, and load. Consequently, the importance of transient plasma dynamics tailoring nanoparticle formation will be pointed out, comparing experimental studies with own calculations and novel simulations taken from literature. Finally, perspectives of surfactant‐free colloidal nanoparticles for unrevealing active sites in heterogeneous catalysts are presented.

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Section: Laser‐based Materials Design: Multi‐elemental Nanoparticlesmentioning

confidence: 99%

Section: Carbon-covered Core-shell Nanostructuresmentioning

confidence: 99%

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

et al. 2019

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“…In comparison, absorption peak at around ∼550 was observed for Cu nanoparticle. The absorption peak of bimetallic alloy Ag 1 ‐Cu 1 nanoparticles exhibits at ∼435 nm which lies in between the Ag and Cu monometallic nanoparticles . For Cu@Ag core‐shell nanoparticles the band at ∼410 nm corresponds to surface plasmon peak for Ag nanoparticles.…”

Section: Resultsmentioning

confidence: 98%

“…TEM micrograph of alloy Ag 1 ‐Cu 3 nanoparticle is presented in Figure S1, where spherical particle are observed with an average particle size of 15±2.5 nm. The crystalline nature was studied by SAED analysis which shows ring like structure with fcc phase of Ag and Cu . The EDS analysis shows the existence of Ag and Cu with 1:3 ratios.…”

Section: Resultsmentioning

confidence: 99%

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Microwave‐Assisted Efficient One‐Pot Multi‐Component Synthesis of Octahydroquinazolinone Derivatives Catalyzed by Cu@Ag Core‐Shell Nanoparticle

et al. 2019

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Core‐shell Cu@Ag nanocatalyst have been synthesized via a two‐step thermal decomposition and galvanic displacement reaction. The nanocatalyst was intensively characterized by various analytical techniques. The formation of core‐shell nanoparticle (NPs) was initially confirmed by UV‐vis analysis followed by high resolution transmission electron microscopy (HRTEM) micrograph with Energy Dispersive X‐ray spectroscopy (EDS) mapping and line scan. This catalyst was found to be a highly efficient catalyst for the synthesis of octahydroquinazolinones. Compared with others, core‐shell nanoparticle of Cu@Ag shows better catalytic activity and much efficiency with high yield of product in less time. The higher activity of Cu@Ag core‐shell nanoparticles can be attributed to the increased oxidation stability of Cu nanoparticles by placing it in the core, lattice contraction and synergistic effect between the two metals. In this study, aromatic aldehydes with various functional groups were employed for the synthesis of octahydroquinazolinones. Later, the catalyst was found to be recyclable upto 5 cycles without any significant loss of activity. Our studies provide a platform for designing other potential core‐shell catalyst for the synthesis of biologically important fine chemicals.

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Introduction of Ag/CuO/MCM‐48 as an efficient catalyst for the one‐pot synthesis of novel pyran‐pyrrole hybrids

Tavakoli

Mamaghani

Sheykhan

2019

Applied Organom Chemis

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Bimetallic silver and copper incorporated mesoporous MCM‐48 (Ag/CuO/MCM‐48) was synthesized by simple wet‐impregnation method. The knowledge about its structural properties was gathered by means of Fourier transform‐infrared, energy‐dispersive X‐ray, X‐ray diffraction, field emission‐scanning electron microscopy, transmission electron microscopy and Brunauer–Emmett–Teller analyses. The catalytic activity of Ag/CuO/MCM‐48 was examined in the one‐pot three‐component reaction of 3‐(1‐methyl‐1H‐pyrrol‐2‐yl)‐3‐oxopropanenitrile, malononitrile and various aromatic aldehydes leading to novel pyran‐pyrrole hybrid derivatives in reduced reaction times (5–10 min) and excellent yields (88–97%). Application of Ag/CuO/MCM‐48 as a potent heterogeneous catalyst with good reusability up to five times, use of ethanol as an eco‐compatible medium and chromatography‐free work‐up are some crucial green aspects of this procedure.

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Bimetallic Ag–Cu alloy nanoparticles as a highly active catalyst for the enamination of 1,3-dicarbonyl compounds

Abstract: Bimetallic Ag–Cu alloy nanoparticles were obtained via a simple co-reduction method, which exhibited significantly improved activity for the synthesis of β-enaminones and β-enaminoesters compared with their monometallic counterparts.

Cited by 55 publications

References 91 publications

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

Microwave‐Assisted Efficient One‐Pot Multi‐Component Synthesis of Octahydroquinazolinone Derivatives Catalyzed by Cu@Ag Core‐Shell Nanoparticle

Introduction of Ag/CuO/MCM‐48 as an efficient catalyst for the one‐pot synthesis of novel pyran‐pyrrole hybrids

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