Synthesis and characterization of ionic liquid immobilized on magnetic nanoparticles: A recyclable heterogeneous organocatalyst for the acetylation of alcohols

Anchoring Ni (II) on Fe3O4@tryptophan: A recyclable, green and extremely efficient magnetic nanocatalyst for one‐pot synthesis of 5‐substituted 1H‐tetrazoles and chemoselective oxidation of sulfides and thiols

“…Figure shows the FT‐IR spectra for Fe 3 O 4 MNPs, Fe 3 O 4 @tryptophan and Fe 3 O 4 @tryptophan@Ni. A strong peak near 578 cm −1 is seen in Figure (a), which verifies the existence of the Fe─ O bond and is evidence for the synthesis of Fe 3 O 4 MNPs . The FT‐IR spectra of Fe 3 O 4 @tryptophan (Figure b) and Fe 3 O 4 @tryptophan@Ni (Figure c) show the band of the bending vibration of NH 2 near 1400 cm −1 this band is shifted to lower wavenumber in the spectrum of Fe 3 O 4 @tryptophan@Ni because of coordination of nitrogen atom of the amino group to nickel .…”

“…A strong peak near 578 cm −1 is seen in Figure 1(a), which verifies the existence of the Fe─ O bond and is evidence for the synthesis of Fe 3 O 4 MNPs. [39] The FT-IR spectra of Fe 3 O 4 @tryptophan ( Figure 1b) and Fe 3 O 4 @tryptophan@Ni (Figure 1c) show the band of the bending vibration of NH 2 near 1400 cm −1 this band is shifted to lower wavenumber in the spectrum of Fe 3 O 4 @tryptophan@Ni because of coordination of nitrogen atom of the amino group to nickel. [40] The FT-IR spectrum of Fe 3 O 4 @tryptophan shows an NH 2 stretching band near 3250 cm −1 while in the Fe 3 O 4 @tryptophan@Ni spectrum this is shifted to 3236 cm −1 .…”

Excellent alkene epoxidation catalytic activity of macrocyclic‐based complex of dioxo‐Mo(VI) on supermagnetic separable nanocatalyst

“…[16,[19][20][21][22][23][24][25] Nowadays, magnetite nanoparticles are of particular interest because of their unique properties including high surface area, low toxicity, ability to be separated and biocompatibility. [16,[26][27][28][29][30] Magnetic separation renders the recycling of catalysts from solution using external magnetic fields much easier than filtration and centrifugation. In continuation of our previous investigation of catalytic activity of Schiff base complexes, [6,[9][10][11]15,19] herein we report the anchoring of novel cisdioxomolybdenum(VI) macrocyclic Schiff base complex by reaction of 1,4-bis(2-carboxyaldehydephenoxy)butane, MoO 2 Cl 2 (DMF) 2 and amino-modified magnetite nanoparticles (Scheme 1).…”

“…[16,[19][20][21][22][23][24][25] Nowadays, magnetite nanoparticles are of particular interest because of their unique properties including high surface area, low toxicity, ability to be separated and biocompatibility. [16,[26][27][28][29][30] Magnetic separation renders the recycling of catalysts from solution using external magnetic fields much easier than filtration and centrifugation.…”

Magnetically Reusable MnFe2O4 Nanoparticles Modified with Oxo‐Peroxo Mo (VI) Schiff‐Base Complexes: A High Efficiency Catalyst for Olefin Epoxidation under Solvent‐Free Conditions

“…Magnetic separa-tion using magnetic catalysts has become highly appealing for highly efficient catalyst recovery. [17,[24][25][26][27][28] Recently, there are great desires for environmentally friendlier and clean chemical processes. On one hand, solvent-less conditions can help us to reduce the disadvantages of using hazardous chlorinated and aromatic solvents.…”