Cu-doped CoFe2O4 nanoparticles as magnetically recoverable catalyst for C N cross-coupling reaction

Dutta, Mintu Maan; Phukan, Prodeep

doi:10.1016/j.catcom.2018.02.014

Cited by 37 publications

(15 citation statements)

References 28 publications

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“…In the last decades, copper complexes (Cu(0), (I), or (II)) along with various ligands have been used for the C-N cross-coupling reactions (known as amination or N-arylation) of aryl halides with different type of amines, [1][2][3][4][5][6] because of the lower cost of copper salts and its application in the cross-coupling reactions as similar as Pd. [7,8] The first copper catalyzed C-N bond formation was developed by Ullman and Goldberg.…”

Section: Introductionmentioning

confidence: 99%

Functionalization of superparamagnetic Fe₃O₄@SiO₂nanoparticles with a Cu(II) binuclear Schiff base complex as an efficient and reusable nanomagnetic catalyst forN‐arylation of α‐amino acids and nitrogen‐containing heterocycles with aryl halides

Sardarian

Kazemnejadi

Esmaeilpour

2020

Applied Organom Chemis

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Fe 3 O 4 @SiO 2 nanoparticles was functionalized with a binuclear Schiff base Cu(II)-complex (Fe 3 O 4 @SiO 2 /Schiff base-Cu(II) NPs) and used as an effective magnetic hetereogeneous nanocatalyst for the N-arylation of α-amino acids and nitrogen-containig heterocycles. The catalyst, Fe 3 O 4 @SiO 2 /Schiff base-Cu (II) NPs, was characterized by Fourier transform infrared (FTIR) and ultraviolet-visible (UV-vis) analyses step by step. Size, morphology, and size distribution of the nanocatalyst were studied by transmission electron microscopy (TEM), scanning electron microscopy (SEM), and dynamic light scatterings (DLS) analyses, respectively. The structure of Fe 3 O 4 nanoparticles was checked by X-ray diffraction (XRD) technique. Furthermore, the magnetic properties of the nanocatalyst were investigated by vibrating sample magnetometer (VSM) analysis. Loading content as well as leaching amounts of copper supported by the catalyst was measured by inductive coupled plasma (ICP) analysis. Also, thermal studies of the nanocatalyst was studied by thermal gravimetric analysis (TGA) instrument. X-ray photoelectron spectroscopy (XPS) analysis of the catalyst revealed that the copper sites are in +2 oxidation state. The Fe 3 O 4 @SiO 2 /Schiff base-Cu(II) complex was found to be an effective catalyst for C-N cross-coupling reactions, which high to excellent yields were achieved for α-amino acids as well as N-hetereocyclic compounds. Easy recoverability of the catalyst by an external magnet, reusability up to eight runs without significant loss of activity, and its well stability during the reaction are among the other highlights of this catalyst.

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Section: Introductionmentioning

confidence: 99%

Functionalization of superparamagnetic Fe₃O₄@SiO₂nanoparticles with a Cu(II) binuclear Schiff base complex as an efficient and reusable nanomagnetic catalyst forN‐arylation of α‐amino acids and nitrogen‐containing heterocycles with aryl halides

Sardarian

Kazemnejadi

Esmaeilpour

2020

Applied Organom Chemis

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“…The formation of the cobalt ferrite phase can be changed the initial properties of iron oxide nanoparticles which can improve the bioapplications of these nanoparticles. Biocompatibility, thermal and chemical stability are the unique properties of spinel ferrite nanoparticles with MFe 2 O 4 (M = Cr, Mn, Co, Ni, Cu, and Zn) the general formula, which has led to abundant applications in the diagnosis and medical sciences [4], [5], [7][8][9][10][11] . The crystal structure of CoFe 2 O 4 is an inverse spinel-type structure where oxygen atoms constitute a face center cubic (FCC) lattice.…”

Section: Introductionmentioning

confidence: 99%

“…Composition ratio, morphology, degree of crystallinity, particle size distribution, doping, and synthesis temperature in uence these materials' magnetic behavior and application. However, the synthesis temperature, dopant, and molar ratio of FeCl 3 /CoCl 2 are the three crucial parameters on the magnetic properties and microstructure of CoFe 2 O 4 nanoparticles sciences [4], [5,7,9,11] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis Factors Dependence of Magnetic Properties of CoFe2O4 and CoFe2-xGdxO4 Semicrystalline Nanoparticles with desired Morphology through Hydrothermal Procedure

Hosseinzadeh

Oveisi

2022

Preprint

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In the present study, CoFe2O4 and CoFe2-xGdxO4 nanoparticles were synthesized by the hydrothermal process. The CoFe2O4 nanoparticles were synthesized at different temperatures (70oC, 100oC, 150oC, and 200oC), molar ratio of CoCl2/ FeCl3 (0/2, 0.75/2, 1/2, 1.5/2, and 2/2). Gadolinium-doped cobalt ferrite (CoFe2-xGdxO4) nanoparticles have also been synthesized with Gd/Fe molar ratios of 0.18 and 0.53. The XRD patterns indicate that cobalt ferrite and Gadolinium-doped cobalt ferrite nanoparticles have been successfully synthesized without impurities with a medium degree of crystallinity. The XRD patterns show that by increasing the synthesis temperature from 70oC to 200oC, the size of the nanoparticles decreased from 50.49nm to 32.45nm while the morphology of the nanoparticles also changed from a shapeless and agglomerated state to a spherical shape. The XPS curve illustrated several peaks corresponding to Fe+3, Co+2, and O 1s. The binding energies for Co and Fe were consistent with Fe 2p and Co 2p binding energies for cobalt ferrite nanoparticles. The magnetic saturation value (Ms) increased from 17.253 emu/g to 54.438 emu/g with a rise in the synthesis temperature. The effects of FeCl3/CoCl2 molar ratio on the magnetic properties showed the highest value of Ms (54.438 emu/g) and the coercivity (HC) of 744.56 Oe for a 2/1 molar ratio. The addition of gadolinium to the composition resulted in a reducing of the magnetic properties of nanoparticles; accordingly, the amount of saturated magnetization was reduced to 22.469 emu/g. Another effect of gadolinium dopant in the composition was a change in nanoparticle morphology from spherical to rod shape. The final aim of this study was to investigate the possible utilization of CoFe2O4 and CoFe2-xGdxO4 nanoparticles in medical treatment in the near future.

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“…The Chan−Lam arylation of benzimidazole has been studied by several research groups. In many cases, the applied copper catalyst is efficient but expensive or not commercially available [17−24] . However, simple and cheap synthetic copper compounds, such as Cu 2 O, [25] Cu(OAc) 2 ⋅H 2 O [26] or Cu 2 S [27] have been found to be excellent catalysts in this transformation as well.…”

Section: Introductionmentioning

confidence: 99%

Chan−Lam Arylation of Benzimidazole and its Derivatives in the Presence of Copper‐Containing Minerals

et al. 2021

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Copper catalysis plays a remarkable role in synthetic organic chemistry. The catalytic activity of copper-containing minerals is not sufficiently presented in the literature, even though the economical value of such procedures is rather high. With the direct usage of these readily available ores, the highly polluting industrial copper production can be avoided. In the present work, the copper-containing mineral catalyzed ChanÀ Lam reaction of benzimidazole, substituted benzimidazoles or imidazole with various phenylboronic acids is described. A total of nine readily available ores were tested in our model reaction with bornite (Cu 5 FeS 4) and chalcocite (Cu 2 S) being the best among them. The in situ formed catalytic system of Cu 5 FeS 4 / TMEDA was able to produce the desired products in up to 98 % yields and it was reusable making this process even more economical and environmentally friendly.

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Cu-doped CoFe2O4 nanoparticles as magnetically recoverable catalyst for C N cross-coupling reaction

Cited by 37 publications

References 28 publications

Functionalization of superparamagnetic Fe₃O₄@SiO₂nanoparticles with a Cu(II) binuclear Schiff base complex as an efficient and reusable nanomagnetic catalyst forN‐arylation of α‐amino acids and nitrogen‐containing heterocycles with aryl halides

Functionalization of superparamagnetic Fe₃O₄@SiO₂nanoparticles with a Cu(II) binuclear Schiff base complex as an efficient and reusable nanomagnetic catalyst forN‐arylation of α‐amino acids and nitrogen‐containing heterocycles with aryl halides

Synthesis Factors Dependence of Magnetic Properties of CoFe2O4 and CoFe2-xGdxO4 Semicrystalline Nanoparticles with desired Morphology through Hydrothermal Procedure

Chan−Lam Arylation of Benzimidazole and its Derivatives in the Presence of Copper‐Containing Minerals

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Cu-doped CoFe2O4 nanoparticles as magnetically recoverable catalyst for C N cross-coupling reaction

Cited by 37 publications

References 28 publications

Functionalization of superparamagnetic Fe3O4@SiO2nanoparticles with a Cu(II) binuclear Schiff base complex as an efficient and reusable nanomagnetic catalyst forN‐arylation of α‐amino acids and nitrogen‐containing heterocycles with aryl halides

Functionalization of superparamagnetic Fe3O4@SiO2nanoparticles with a Cu(II) binuclear Schiff base complex as an efficient and reusable nanomagnetic catalyst forN‐arylation of α‐amino acids and nitrogen‐containing heterocycles with aryl halides

Synthesis Factors Dependence of Magnetic Properties of CoFe2O4 and CoFe2-xGdxO4 Semicrystalline Nanoparticles with desired Morphology through Hydrothermal Procedure

Chan−Lam Arylation of Benzimidazole and its Derivatives in the Presence of Copper‐Containing Minerals

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Functionalization of superparamagnetic Fe₃O₄@SiO₂nanoparticles with a Cu(II) binuclear Schiff base complex as an efficient and reusable nanomagnetic catalyst forN‐arylation of α‐amino acids and nitrogen‐containing heterocycles with aryl halides

Functionalization of superparamagnetic Fe₃O₄@SiO₂nanoparticles with a Cu(II) binuclear Schiff base complex as an efficient and reusable nanomagnetic catalyst forN‐arylation of α‐amino acids and nitrogen‐containing heterocycles with aryl halides