Nanoparticle-supported and magnetically recoverable organic–inorganic hybrid copper(<scp>ii</scp>) nanocatalyst: a selective and sustainable oxidation protocol with a high turnover number

Rathore, Puran Singh; Patidar, Rajesh; Thakore, Sonal

doi:10.1039/c4ra06599a

Cited by 18 publications

(9 citation statements)

References 64 publications

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“…As the concentration of Fe 3 O 4 decreased, the saturation magnetization decreased. Compared with Fe 3 O 4 NPs reported previously[8,12,13,29], these as-prepared products show higher coercivity values which are 338 Oe (Fe 3 O 4 @SiO 2…”

mentioning

confidence: 59%

“…A normal solving method is to immobilize and graft the NPs onto inorganic supports, such as polystyrene silica, carbon, and magnetic NPs to form a core/shell nanostructure [9][10][11]. Among these supports, Fe 3 O 4 @SiO 2 nanocomposites (NCs) have long been employed as promising supports to enhance the dispersion and recovery of Ag based catalysts [12,13]. The Fe 3 O 4 @SiO 2 NCs can be easily recovered by magnetic separation, and the silica shell coated outside the Fe 3 O 4 NPs supplies not only a protection for the magnetic core from corrosion but also a suitable supporting matrix to incorporate other functional materials.…”

Section: Introductionmentioning

confidence: 99%

“…Apart from the size and composition, shape and morphology could also significantly influence their practical properties. Previously researches have shown that high aspect ratio nanostructures (e.g., ellipsoidal particles) may present higher catalytic rate than low aspect ratio nanostructures in heterogeneous catalysis systems [15,16] cubes [8,12,17,18]; rare reports were focused on the anisotropic nanostructures. In this letter, we develop a facile step-by-step route to deposit well-dispersed Ag NPs on Fe 3 O 4 @SiO 2 nanorods (NRs) for the first time.…”

Section: Introductionmentioning

confidence: 99%

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Ag-Decorated Fe₃O₄@SiO₂Nanorods: Synthesis, Characterization, and Applications in Degradation of Organic Dyes

Sun

Chen

et al. 2016

Journal of Nanomaterials

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Well-dispersed Ag nanoparticles (NPs) are successfully decorated on Fe 3 O 4 @SiO 2 nanorods (NRs) via a facile step-by-step strategy. This method involves coating -Fe 2 O 3 NRs with uniform silica layer, reduction in 10% H 2 /Ar atmosphere at 450 ∘ C to obtain Fe 3 O 4 @SiO 2 NRs, and then depositing Ag NPs on the surface of Fe 3 O 4 @SiO 2 NRs through a sonochemical step. It was found that the as-prepared Ag-decorated magnetic Fe 3 O 4 @SiO 2 NRs (Ag-MNRs) exhibited a higher catalytic efficiency than bare Ag NPs in the degradation of organic dye and could be easily recovered by convenient magnetic separation, which show great application potential for environmental protection applications.

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mentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ag-Decorated Fe₃O₄@SiO₂Nanorods: Synthesis, Characterization, and Applications in Degradation of Organic Dyes

Sun

Chen

et al. 2016

Journal of Nanomaterials

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“…From Fig. , it can be seen that the main peaks of Cu 2p 3/2 and Cu 2p 1/2 in Fe 3 O 4 @SiO 2 ‐DAQ‐Cu(II) nanoparticles are about 934.61 eV and 942.67 eV indicating that Cu is in the formal +2 valance state …”

Section: Resultsmentioning

confidence: 96%

One‐pot synthesis of 1‐ and 5‐substituted 1H‐tetrazoles using 1,4‐dihydroxyanthraquinone–copper(II) supported on superparamagnetic Fe₃O₄@SiO₂ magnetic porous nanospheres as a recyclable catalyst

Esmaeilpour

Javidi

Zahmatkesh

2016

Applied Organom Chemis

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An effective one-pot, convenient process for the synthesis of 1-and 5-substituted 1H-tetrazoles from nitriles and amines is described using1,4-dihydroxyanthraquinone-copper(II) supported on Fe 3 O 4 @SiO 2 magnetic porous nanospheres as a novel recyclable catalyst. The application of this catalyst allows the synthesis of a variety of tetrazoles in good to excellent yields. The preparation of the magnetic nanocatalyst with core-shell structure is presented by using nano-Fe 3 O 4 as the core, tetraethoxysilane as the silica source and poly(vinyl alcohol) as the surfactant, and then Fe 3 O 4 @SiO 2 was coated with 1,4-dihydroxyanthraquinonecopper(II) nanoparticles. The new catalyst was characterized using Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, field emission scanning electron microscopy, dynamic light scattering, thermogravimetric analysis, vibration sample magnetometry, X-ray photoelectron spectroscopy, nitrogen adsorption-desorption isotherm analysis and inductively coupled plasma analysis. This new procedure offers several advantages such as short reaction times, excellent yields, operational simplicity, practicability and applicability to various substrates and absence of any tedious workup or purification. In addition, the excellent catalytic performance, thermal stability and separation of the catalyst make it a good heterogeneous system and a useful alternative to other heterogeneous catalysts. Also, the catalyst could be magnetically separated and reused six times without significant loss of catalytic activity.

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“…More recently, Stahl and coworkers described a (bpy)Cu(I)/nitroxyl co‐catalyst system that enables the efficient and selective aerobic oxidation of a broad range of primary and secondary alcohols to the corresponding aldehydes and ketones . Only few reports have dealt with the immobilization of Cu(I)‐bipyridine catalysts on support materials to investigate the aerobic oxidation of alcohols to carbonyl compounds using either magnetic nanoparticles, MCM‐41, polytetrafluoroethylene‐membrane flow reactors, polymer micelles or porous coordination polymers …”

Section: Introductionmentioning

confidence: 99%

Bipyridine copper functionalized polymer resins as support materials for the aerobic oxidation of alcohols

Sand

Weberskirch

2016

Polymer International

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Here, we report the first polymer resin supported Cu(I)/bipyridine/N-oxyl catalyst systems for the aerobic oxidation of alcohols at room temperature with ambient air. We chose polystyrene-poly(ethylene glycol) copolymer (TentaGel ® ) and Merrifield resin as support materials because of their different swelling properties in polar and nonpolar solvents. The bromo functionalized TentaGel resin TG1 or Merrifield resin MR1 were functionalized with 4,4 ′ -dimethoxy-2,2 ′ -bipyridine ( MeO bpy) to give the ligand modified polymer resin TG2/MR2 that was loaded with Cu I (Br) to give the final Cu I (Br)/bipyridine support TG3/MR3. These resins were characterized by Fourier transform infrared, SEM, SEM energy dispersive X-ray spectroscopy and elemental analysis. Catalytic activity and recyclability of TG3 was investigated in acetonitrile and cyclohexane and displayed high activities in acetonitrile but also high metal leaching. In cyclohexane as solvent leaching was reduced to 1% − 2%, and catalytic activity was still at 75% after the fifth run. MR3 was consequently tested in cyclohexane and toluene. In both solvents low metal leaching was observed with higher activity in toluene as solvent, showing still over 90% conversion after the seventh run with 9-azabicyclo[3.3.1]nonane N-oxyl (ABNO) and 80% with 2,2,6,6-tetramethyl-1-piperidinyloxyl (TEMPO).

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Nanoparticle-supported and magnetically recoverable organic–inorganic hybrid copper(ii) nanocatalyst: a selective and sustainable oxidation protocol with a high turnover number

Cited by 18 publications

References 64 publications

Ag-Decorated Fe₃O₄@SiO₂Nanorods: Synthesis, Characterization, and Applications in Degradation of Organic Dyes

Ag-Decorated Fe₃O₄@SiO₂Nanorods: Synthesis, Characterization, and Applications in Degradation of Organic Dyes

One‐pot synthesis of 1‐ and 5‐substituted 1H‐tetrazoles using 1,4‐dihydroxyanthraquinone–copper(II) supported on superparamagnetic Fe₃O₄@SiO₂ magnetic porous nanospheres as a recyclable catalyst

Bipyridine copper functionalized polymer resins as support materials for the aerobic oxidation of alcohols

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Nanoparticle-supported and magnetically recoverable organic–inorganic hybrid copper(ii) nanocatalyst: a selective and sustainable oxidation protocol with a high turnover number

Cited by 18 publications

References 64 publications

Ag-Decorated Fe3O4@SiO2Nanorods: Synthesis, Characterization, and Applications in Degradation of Organic Dyes

Ag-Decorated Fe3O4@SiO2Nanorods: Synthesis, Characterization, and Applications in Degradation of Organic Dyes

One‐pot synthesis of 1‐ and 5‐substituted 1H‐tetrazoles using 1,4‐dihydroxyanthraquinone–copper(II) supported on superparamagnetic Fe3O4@SiO2 magnetic porous nanospheres as a recyclable catalyst

Bipyridine copper functionalized polymer resins as support materials for the aerobic oxidation of alcohols

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Ag-Decorated Fe₃O₄@SiO₂Nanorods: Synthesis, Characterization, and Applications in Degradation of Organic Dyes

Ag-Decorated Fe₃O₄@SiO₂Nanorods: Synthesis, Characterization, and Applications in Degradation of Organic Dyes

One‐pot synthesis of 1‐ and 5‐substituted 1H‐tetrazoles using 1,4‐dihydroxyanthraquinone–copper(II) supported on superparamagnetic Fe₃O₄@SiO₂ magnetic porous nanospheres as a recyclable catalyst