Synthesis and characterization of Piperidine-4-carboxylic acid functionalized Fe3O4 nanoparticles as a magnetic catalyst for Knoevenagel reaction

Immobilized palladium on modified magnetic nanoparticles and study of its catalytic activity in suzuki–miyaura C–C coupling reaction

“…Furthermore, it has been reported that the wavenumber separation between the COO − (as) and COO − (s) FT‐IR bands can be used to distinguish the type of interaction. Since the wavenumber separation between the COO − (as) and COO − (s) bands is 172 cm −1 (1595–1423 = 172 cm −1 ), it can be concluded that the interaction between the COO − group and the Fe atom is covalent and bridging bidentate . These results provide evidence that the PPCA groups are successfully attached to the surface of Fe 3 O 4 nanoparticles.…”

Synthesis and conductivity studies of piperidine-4-carboxylic acid functionalized Fe3O4 nanoparticles

“…3c). Magnetic evaluation of these nanoparticles is performed and magnetic core size estimation (by Langevin function) yielded 9 AE 1 nm (data not shown) [31]. Crystallite size estimated from XRD (10 AE 0.1 nm), particle size estimated from TEM and magnetic core size are in a good agreement which may be an indication of nearly single crystalline character of Fe 3 O 4 nanoparticle in the nanocomposite.…”

Cr(III)‐containing Fe3O4/mercaptopropanoic acid‐poly(2‐hydroxyethyl acrylate) nanocomposite: Highly active magnetic catalyst for direct hydroxylation of benzene

“…It is also clear that the strong CO band of carboxyl group, which is generally present at 1650 cm −1 , was absent in the spectrum of Fe 3 O 4 /MPA [Figure (a)]. Instead, two characteristic bands appeared at 1588 and 1514 cm −1 , which can be ascribed to COO − as and COO − s stretch of carboxyl group . It has been reported that the wavenumber separation between the COO − as and COO − s IR bands can be used to distinguish the type of the interaction between the carboxylate head and the metal atom .…”

“…In the first step, MPA‐coated Fe 3 O 4 nanoparticles was synthesized by a co‐precipitation method as reported previously . FeCl 3 ·6H 2 O (13 g) and FeCl 2 ·4H 2 O (4.8 g) were dissolved in 100 mL deionized water and stirred at 40°C for 15 min under nitrogen atmosphere.…”