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Novel Pd nanoparticles were prepared in five successive stages: 1) preparation of the Fe3O4 magnetic nanoparticles (Fe3O4 MNPs), 2) coating of Fe3O4 MNPs with SiO2 (Fe3O4@SiO2), 3) functionalization of Fe3O4@SiO2 with 3‐chloropropyltrimethoxy‐ silane (CPTMS) ligand (Fe3O4@SiO2@CPTMS), 4) further functionalization with 3,5‐diamino‐1,2,4‐triazole (DAT) ligand (Fe3O4@SiO2@CPTMS @DAT), and 5) the complexation of Fe3O4@SiO2@CPTMS@DAT with PdCl2 (Fe3O4@SiO2@CPTMS@ DAT@Pd). Then, the obtained Pd nano‐catalyst characterized by different methods such as the elemental analysis (CHN), FT‐IR, XRD, EDX, SEM, TEM, TG‐DTA and VSM. Finally, the Pd catalyst was applied for the synthesis of various 2‐imino‐3‐phenyl‐2,3‐dihydrobenzo[d]oxazol‐5‐ols. [ABSTRACT FROM AUTHOR]

Abstract: The Fe3O4 magnetic particles were modified with 1,10‐phenanthroline‐5,6‐diol (Phen) and the related Mn complex (Fe3O4@Phen@Mn) synthesized as a heterogeneous catalyst to be used for the one‐pot three‐component synthesis of various tetrazoles. The catalysts were characterized by several methods, such as the elemental analysis, FT‐IR, X‐ray powder diffraction, dispersive X‐ray spectroscopy, scanning electron microscopy, transmission electron microscopy, dynamic light scattering, thermogravimetric‐differential thermal analysis, vibrating sample magnetometer and X‐ray photoelectron spectroscopy. In addition, the antioxidant and antibacterial activities of the catalyst and its Phen ligand were in vitro screened with 2,2‐diphenyl‐1‐picrylhydrazyl by free radical scavenging methods. Results showed that the synthesized compounds possess strong antioxidant activity (IC50; 0.172  ±  0.005 mg ml−1) as well as a good antibacterial potential in comparison to standards. [ABSTRACT FROM AUTHOR]

The Fe3O4 magnetic nano-particles were modified with 1,10-phenanthroline-5,6-diol and the relevant Mn complex (Fe@Phendiol@Mn) synthesized as a nano-magnetic heterogeneous catalyst to be used for the synthesis of various arylaminotetrazoles from various arylcyanamides and sodium azide in DMF at 120 °C. Also, the nano-catalyst characterized by different methods such as the elemental analysis (CHN), ICP, FT-IR, XRD, EDX, SEM, TEM, TG-DTA, VSM and XPS. In addition, the theoretical study of the Fe@Phendiol@Mn nano-catalyst was performed using the Gausian software. The calculated results showed that the Gibbs free energy and the standard enthalpy values are negative; therefore the complex is stable. Incidentally, the computational chemistry descriptions including the electronic chemical potential, global hardness, electrophilicity index, energy gap, global softness and electronegativity were calculated. [ABSTRACT FROM AUTHOR]

The Fe3O4 magnetic nanoparticles (Fe3O4 MNPs) were modified with 1,10-phenanthroline-5,6-diol and the relevant Co complex (Fe3O4@Phendiol@Co) synthesized as a nano-magnetic heterogeneous catalyst to be used for the N-formylation of various amines at room temperature under solvent-free conditions. Also, in order to find the better concept of the catalyst role, the N-formylation reaction was carried out by the use of ultrasound irradiation in the absence of the Co nano-catalyst and the results were compared. The catalyst characterized by different methods such as the elemental analysis (CHN), ICP, FT-IR, XRD, EDX, SEM, TEM, TG-DTA, VSM and XPS. In addition, the antioxidant and the antibacterial activities of the Fe3O4@Phendiol@Co nano-catalyst and its Phendiol ligand were in vitro screened by 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging and disc diffusion methods. Results showed that they possess strong antioxidant activity (IC50; 0.182 ± 0.006 mg/ml) and good antibacterial potential in comparison to standards. [ABSTRACT FROM AUTHOR]