“…4 b). This result confirms the successful coating of the Fe 3 O 4 @C with guanidine modified MCM-41 shell without causing any damage in its mesoporous structure 21 , 64 . Figure 4 LXRD pattern of ( a ) MCM-41 and ( b ) Fe 3 O 4 @C@MCM41-guanidine.…”
In this study, preparation, characterization and catalytic application of a novel core–shell structured magnetic with carbon and mesoporous silica shells supported guanidine (Fe3O4@C@MCM41-guanidine) are developed. The Fe3O4@C@MCM41-guanidine was prepared via surfactant directed hydrolysis and condensation of tetraethyl orthosilicate around Fe3O4@C NPs followed by treatment with guanidinium chloride. This nanocomposite was characterized by using Fourier transform infrared spectroscopy, vibrating sample magnetometry, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, thermal gravimetric analysis, wide-angle X-ray diffraction and low-angle X-ray diffraction techniques. This nanocomposite have high thermal, chemical stability, and uniform size. Fe3O4@C@MCM41-guanidine catalyst demonstrated high yield (91–98%) to prepare of Knoevenagel derivatives under the solvent free conditions at room temperature in the shortest time. Also, this catalyst was recovered and reused 10 times without significant decrease in efficiency and stability. Fortunately, an excellent level of yield (98–82%) was observed in the 10 consecutive catalyst cycles.
“…4 b). This result confirms the successful coating of the Fe 3 O 4 @C with guanidine modified MCM-41 shell without causing any damage in its mesoporous structure 21 , 64 . Figure 4 LXRD pattern of ( a ) MCM-41 and ( b ) Fe 3 O 4 @C@MCM41-guanidine.…”
In this study, preparation, characterization and catalytic application of a novel core–shell structured magnetic with carbon and mesoporous silica shells supported guanidine (Fe3O4@C@MCM41-guanidine) are developed. The Fe3O4@C@MCM41-guanidine was prepared via surfactant directed hydrolysis and condensation of tetraethyl orthosilicate around Fe3O4@C NPs followed by treatment with guanidinium chloride. This nanocomposite was characterized by using Fourier transform infrared spectroscopy, vibrating sample magnetometry, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, thermal gravimetric analysis, wide-angle X-ray diffraction and low-angle X-ray diffraction techniques. This nanocomposite have high thermal, chemical stability, and uniform size. Fe3O4@C@MCM41-guanidine catalyst demonstrated high yield (91–98%) to prepare of Knoevenagel derivatives under the solvent free conditions at room temperature in the shortest time. Also, this catalyst was recovered and reused 10 times without significant decrease in efficiency and stability. Fortunately, an excellent level of yield (98–82%) was observed in the 10 consecutive catalyst cycles.
“…This result confirms the effective application of the kryptofix-21/Cu-modified MCM-41 shell onto Fe 3 O 4 , without compromising the integrity of its mesoporous structure. 53 Once the optimal reaction conditions were determined, we proceeded to explore the scope of the reaction by employing different azides (the primary azides) and phenylacetylene. To accomplish this, in the preliminary phase, we examined the reaction using various azides, and the findings are presented in Table 2.…”
A novel porous and magnetic nanoparticle, composed of Fe3O4/MCM‐41 functionalized with a kryptofix‐21 crown ether, has been successfully synthesized. This was achieved through the treatment of 3‐chloropropyl functionalized Fe3O4/MCM‐41 with the crown ether, followed by the grafting of Cu (II) onto the material, resulting in the formation of Fe3O4/MCM‐41/kryptofix‐21/Cu. The material's 2D‐hexagonally ordered mesophases were analyzed using small‐angle‐PXRD and TEM‐imaging. The Cu (II)‐anchored porous material, Fe3O4/MCM‐41/kryptofix‐21/Cu, exhibited remarkable catalytic activity in the Click reaction between azides and phenylacetylene, conducted in ethylene glycol/water at a temperature of 70 °C. This reaction led to the synthesis of a diverse range of 1,4‐disubstituted 1,2,3‐triazoles. The catalyst demonstrated excellent recyclability, maintaining its catalytic activity for up to eight cycles without any significant loss. Furthermore, no significant leaching of Cu was observed, highlighting the potential of this magnetically innovative nanoporous catalyst in the regioselective formation of 1,4‐disubstituted 1,2,3‐triazolic compounds.
“…The unique properties of magnetic NPs such as biocompatibility and easy magnetic separation, has led other sciences such as chemistry, physics, pharmacy and medicine to pay particular attention to these particles. Therefore, the use of magnetic nanocatalysts not only saves time but also prevents problems such as catalyst degradation, catalyst oxidation and the preparation of organic waste ( Gawande et al, 2015 ; Mirhosseini-Eshkevari et al, 2015 ; Zhang et al, 2017 ; Karimi et al, 2018 ; Kargar et al, 2020 ; Mousavi et al, 2021 ). Also, magnetite nanoparticles have wide applications in the drug delivery, cancer treatment, purification of water contaminated with heavy metals and radioactive materials, magnetic resonance imaging, etc.…”
In the present study, a novel magnetic ethylene-based periodic mesoporous organosilica supported Pd-Schiff base complex (Fe3O4@PMO/SB-Pd) was prepared, characterized and applied as a recoverable nanocatalyst for green synthesis of Suzuki products. Chemical composition, magnetic and thermal behavior, morphology and particle size of Fe3O4@PMO/SB-Pd were investigated by using FT-IR, TGA, EDX, VSM, PXRD, TEM and Scanning electron microscopy (SEM) analyses. The Fe3O4@PMO/SB-Pd nanocomposite was applied as an efficient nanocatalyst in the Suzuki reaction under ultrasonic conditions giving corresponding products in high yield. Some advantages of this study are simple purification of products, the use of water solvent, easy catalyst separation, short reaction time and high catalyst efficiency and recoverability.
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