MgFe2O4@SiO2-PrNH2/Pd/bimenthonoxime core-shell magnetic nanoparticles as a recyclable green catalyst for heterogeneous Suzuki cross-coupling in aqueous ethanol

Mahmoudzadeh, Mansour; Mehdipour, Ebrahim; Eisavi, Ronak

doi:10.1080/00958972.2019.1590562

Cited by 17 publications

(15 citation statements)

References 71 publications

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“…For example, in recent years, different types of nanoparticle support materials were investigated; for example, metal oxides [ 29 , 30 , 31 ], zeolites [ 32 , 33 , 34 ], carbons [ 35 , 36 , 37 ], ordered porous materials [ 38 , 39 ] and synthesized polymers [ 40 ] (e.g., ionic polymers [ 41 ]) and modified natural polymers [ 42 , 43 ]. There are several studies on mixed composition for palladium nanoparticle (PdNP) support [ 44 , 45 , 46 , 47 ], and the need for a rational design of catalyst support has been emphasized [ 48 , 49 ]. In pursuit of a rational approach to the creation of a catalytic system based on PdNPs, we have chosen phosphonium salts with a sterically hindered cation with a variable fourth alkyl chain.…”

Section: Introductionmentioning

confidence: 99%

Sterically Hindered Phosphonium Salts: Structure, Properties and Palladium Nanoparticle Stabilization

et al. 2020

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A new family of sterically hindered alkyl(tri-tert-butyl) phosphonium salts (n-CnH2n+1 with n = 2, 4, 6, 8, 10, 12, 14, 16, 18, 20) was synthesized and evaluated as stabilizers for the formation of palladium nanoparticles (PdNPs), and the prepared PdNPs, stabilized by a series of phosphonium salts, were applied as catalysts of the Suzuki cross-coupling reaction. All investigated phosphonium salts were found to be excellent stabilizers of metal nanoparticles of small catalytically active size with a narrow size distribution. In addition, palladium nanoparticles exhibited exceptional stability: the presence of phosphonium salts prevented agglomeration and precipitation during the catalytic reaction.

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Section: Introductionmentioning

confidence: 99%

Sterically Hindered Phosphonium Salts: Structure, Properties and Palladium Nanoparticle Stabilization

et al. 2020

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“…The presence of SiO 2 is con rmed by the stretching and bending vibrations of Si-O. The absorption bands at 803 and 1097 cm − 1 are related to Si-O-Si stretching vibrations, and the band observed at 478 cm − 1 belongs to the bending vibration of SiO 2 [59]. The peak at 950 cm − 1 belongs to the Mo-O stretching vibrations, which con rms the existence of phosphomolybdic acid 63 .…”

Section: Catalyst Characterizationmentioning

confidence: 73%

“…Preparation of silica coated MNPs (Fe 3 O 4 @SiO 2 ). Silica coated MNPs of Fe 3 O 4 @SiO 2 were synthesized through an improved sol-gel method 59 . In a typical procedure, 0.5 g Fe 3 O 4 MNPs was added to a mixed solution of ethanol (50 mL), distilled water (10 mL) and NH 3 •H 2 O (2.5 mL, 25%) and dispersed using ultrasonication for 1.5 h. Then 1.5 mL TEOS (tetraethyl orthosilicate) was added dropwise to the above mixture and sonicated for a further 15 min.…”

Section: Methodsmentioning

confidence: 99%

“…The signi cant diffraction peaks are observed in case of PMA at 2Ө = 8.95°, 18.49°, 26.43°, 27.65° and 28.84° corresponding to (011), (202), (141), (311) and (312) crystallographic planes respectively (JCPDS: 00-043-0317) 65 . The broad peak at 2Ө = 22.90° is related to the amorphous SiO 2 shell on the surface of Fe 3 O 4 59 . The copper diffraction peaks were compared with the standard sample (JCPDS 04-0836), and peaks appearing at 2Ө = 43.71°, 50.70°, and 74.32° corresponding to the (111), (200), and (220) planes respectively, revealed the excellent agreement of the synthesized sample with its standard sample 31 .…”

Section: Catalyst Characterizationmentioning

confidence: 99%

“…Considering all these aspects, and in continuation of our previous works [54][55][56][57][58][59][60] , herein we wish to introduce Fe 3 O 4 @SiO 2 -PMA-Cu nanocomposite as an e cient and novel catalyst, where PMA clusters are found to be anchored on Fe 3 O 4 @SiO 2 surface and copper nanoparticles are supported on the PMA surface. The new synthesized nanocomposite was utilized in three-component synthesis of β-thiol-1,4disubstituted-1,2,3 triazoles from sodium azide, thiiranes, and terminal alkynes as a green and recyclable magnetic catalyst (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Green approach for the regioselective synthesis of β-thiol-1,4-disubstituted-1,2,3-triazoles using Fe3O4@SiO2-PMA-Cu as a novel and efficient magnetically recoverable nanocatalyst

Eisavi

Ahmadi

2022

Preprint

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The magnetic nanoparticles of Fe3O4 were synthesized through a solid-state reaction of hydrated iron (III) chloride, hydrated iron (II) chloride and NaOH, and then purified by calcination at high temperature. To protect ferrite nanoparticles from oxidation and agglomeration, as well as to manufacture a novel catalytic system of anchored copper on the magnetic substrate, the Fe3O4 was core-shelled by adding tetraethyl orthosilicate. Next, the prepared Fe3O4@SiO2 was supported by phosphomolybdic acid (PMA) as the second layer of nanocomposite at 80 °C after 30 hours. Eventually, the new nanocomosite of Fe3O4@SiO2-PMA-Cu was successfully synthesized by adding copper (II) chloride solution and solid potassium borohydride. The structure of magnetic nanocatalyst was acknowledged through different techniques such as EDS, VSM, XRD, TEM, FT-IR, and FESEM. The synthesis of β-thiolo/benzyl-1,2,3-triazoles from various thiiranes, terminal alkynes and sodium azide was catalyzed by Fe3O4@SiO2-PMA-Cu nanocomposite in aqueous medium. In order to obtain the optimum condition, the effect of reaction time, temperature, catalyst amount and solvent was evaluated. The recycled catalyst was used for several consecutive runs without any loss of activity.

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Structural studies of silica‐supported spinel magnesium ferrite nanorods for photocatalytic degradation of methyl orange

Kazi

Inamdar

Kamble

et al. 2022

J Chinese Chemical Soc

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A novel, well‐designed, silica‐supported magnesium ferrite nanorods were successfully developed at room temperature using the co‐precipitation method. The synthesized nanorods show an optical band gap of 3.1 eV, with the maximum wavelength absorptive at 334 nm. The average particle size is 36 nm with the FCC crystal structure by the X‐ray Diffraction technique (XRD). TGA achieved thermal stability of targeted mesoporous materials at 600°C. Field Emission Scanning Electron Microscopy (FE‐SEM) and High‐Resolution Transmission Electron Microscopy (HR‐TEM) techniques confirm the rod‐like structure. Energy Dispersive Spectroscopy (EDS) and X‐Ray Fluorescence (XRF) studies reveal the presence of all elements in the composition. The synthesized nanorods are highly magnetic by the vibrating sample magnetometer (VSM) technique, which shows a high coercivity value, that is, MgFe2O4@SiO2 is photocatalytically active. From BET analysis, the surface area, pore volume, and pore diameter are 19.2 m2 g−1, 2.46 cm3 g−1, and 5.10 nm, respectively. The experimental outcomes predict that the degradation efficiency (79%) of methyl orange dye was accomplished using MgFe2O4SiO2 nanorods within 270 min.

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MgFe₂O₄@SiO₂-PrNH₂/Pd/bimenthonoxime core-shell magnetic nanoparticles as a recyclable green catalyst for heterogeneous Suzuki cross-coupling in aqueous ethanol

Cited by 17 publications

References 71 publications

Sterically Hindered Phosphonium Salts: Structure, Properties and Palladium Nanoparticle Stabilization

Sterically Hindered Phosphonium Salts: Structure, Properties and Palladium Nanoparticle Stabilization

Green approach for the regioselective synthesis of β-thiol-1,4-disubstituted-1,2,3-triazoles using Fe3O4@SiO2-PMA-Cu as a novel and efficient magnetically recoverable nanocatalyst

Structural studies of silica‐supported spinel magnesium ferrite nanorods for photocatalytic degradation of methyl orange

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