Fe₃O₄/MIL‐101(Fe) nanocomposite as an efficient and recyclable catalyst for Strecker reaction

Abstract

A highly porous metal‐organic framework, MIL‐101(Fe), was prepared by a solvothermal method in the presence of amino‐modified Fe3O4@SiO2 nanoparticles, in order to achieve Fe3O4/MIL‐101(Fe) nanocomposite, which was characterized by XRD, FT‐IR, SEM, TEM, BET, and VSM. This hybrid magnetic nanocomposite was employed as heterogeneous catalyst for α‐amino nitriles synthesis through three‐component condensation reaction of aldehydes (ketones), amines, and trimethylsilyl cyanide in EtOH, at room temperature. The recoverability and reusability was admitted for the heterogeneous magnetic catalyst; no significant reduction of catalytic activity was observed even after five consecutive reaction cycles.

Synthesis of bioactive magnetic nanoparticles spiro[indoline‐3,4′‐[1,3]dithiine]@Ni (NO3)2 supported on Fe3O4@SiO2@CPS as reusable nanocatalyst for the synthesis of functionalized 3,4‐dihydro‐2H‐pyran

“…According to previous reports, the XRD pattern of first to third steps shows the standard XRD pattern of crystalline cubic spinel Fe 3 O 4 nanoparticles . XRD pattern of the fourth step and final synthesized compounds, standard XRD pattern of crystalline cubic spinel Fe 3 O 4 nanoparticles in positions of 2θ angles at 30.2°, 35.69°, 43.5°, 53.75°, 57.6° and 63.8° were shown.…”

“…In the first step, Fe 3 O 4 nanoparticles were synthesized by using the previous method . Coating of Fe3O4 nanoparticles was carried out in the second step using the suggested methods . In the third step, Fe 3 O 4 @SiO 2 @CPS were synthesized from the reaction of Fe 3 O 4 @SiO 2 and CPTMS compounds .…”

“…In continuation, 1 ml of tetraethyl orthosilicate (TEOS) was added dropwise over 10 minutes to the mixture, and the reaction was stirred 24 hr. The silica‐coated nanoparticles (Fe 3 O 4 @ SiO 2 ) were isolated by an external magnet, washed several times with DI water and EtOH, and then dried under vacuum at 80 °C for 24 hr …”

Fe3O4@MOF Magnetic Nanocomposites: Synthesis and Applications

“…In another study, Mostafavi and colleagues synthesized a Fe 3 O 4 /MIL‐101(Fe) nanocomposite by using MIL‐101(Fe) in the presence of amino‐modified Fe 3 O 4 @SiO 2 NPs through a solvothermal approach (Figure ) . They used (3‐Aminopropyl)triethoxysilane (APTES) for modification of the surface of Fe 3 O 4 NPs to protect them from aggregation.…”

Synthesis of quinazolines over recyclable Fe3O4@SiO2‐PrNH2‐Fe3+ nanoparticles: A green, efficient, and solvent‐free protocol

“…Therefore, the design of new strategy for synthesis of quinazolinones has attracted many researchers. Recently, there has been exponential growth in creating magnetic nanoparticles (MNPs) and led to their potential applications in some fields such as biomedicine, catalysis, environmental protection, and energy storage . Especially as catalyst, MNPs have attracted considerable attention because of their easy separation from the mother solution by magnetic decantation rather than time‐consuming filtration .…”