The effect of a ligand structure on the catalytic activity of salophen chromium(iii) complexes in the ring-opening copolymerization of phthalic anhydride with a series of epoxides was studied.

New polymer supported Cu(II) complexes based on an epoxy functionalized gel type resin were prepared using the multi-stage procedures. The reactions of epoxy groups with ethylenediamine or tris(2-aminoethyl)amine, and then NH 2 groups with salicylaldehydes were used for the preparation of a series of amine-imine functionalized polymer supports. Copper(II) acetate was used as a source of metal ions. The complexes were characterized using ICP-OES, FTIR, DR UV-Vis and TGA techniques, and tested as catalysts in two model C-N and a series of A 3 coupling reactions. Their catalytic activity was rather low in the C-N coupling reactions between imidazole and iodobenzene or phenylboronic acid. However, the second of the reactions could be conducted effectively under milder conditions. The complexes were efficient used as recyclable catalysts in the A 3 coupling reactions.A series of aromatic aldehydes and secondary amines and phenylacetylene could be coupled using 1% mol catalyst.

Abstract. In this study, Fe 3 O 4 nanoparticles (NPs) were functionalized with copolymer or terpolymer bearing glycidyl methacrylate (GMA) moieties making them suitable for potential applications as drug delivery systems (DDS). For this purpose, the surface of magnetic nanoparticles was first coated with 3-(trimethoxysilyl) propyl methacrylate (MPS) by a silanization reaction to introduce reactive methacrylate groups onto the surface. Subsequently, monomers were grafted onto the surface of modified-MPS particles via two polymerization methods: seed emulsion (GMA, divinylbenzene, DVB, and styrene, S) and distillation -precipitation (GMA and DVB). The obtained nanocomposite particles were characterized by FTIR (Fourier transform infrared spectroscopy), DR UV-Vis (diffuse reflectance ultraviolet -visible spectroscopy), TEM (transmission electron microscopy) combined with EDS (energy dispersive X-ray spectroscopy) analysis and DLS (dynamic light scattering). FTIR spectroscopy showed that indeed a polymer -Fe 3 O 4 @MPS composite was obtained. TEM and EDS analysis showed that the seed emulsion method resulted in nanosized, 100 nm Fe 3 O 4 @MPS core/polymer shell NPs, forming long chains. On the contrary, the distillation -precipitation method caused the formation of an inverted structure, i.e. polymer core coated by a Fe 3 O 4 @MPS shell, which exhibited a very coarse size distribution varying from several hundreds to over 2 µm.

Hydroxy-functionalized polymers have been synthesized by Pickering suspension polymerization of 2-hydroxyethyl methacrylate (HEMA) with styrene (S) and divinylbenzene (DVB) in the presence of hydrophobic Fe 3 O 4 particles. The obtained polymer microspheres were characterized using different instrumental techniques (optical microscopy, scaning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), diffuse reflection ultraviolet-visible spectroscopy (DR UV-Vis), inductively coupled plasma-optical emission spectrometry (ICP-OES), dynamic light scattering and thermal analyses) and then modified to immobilize the complexes of palladium(II) with the tetradentate ligands based on salicylaldehyde, epichlorohydrin and 2-picolylamine. The resulting polymer supported complexes were preliminarily examined as catalysts in the model Suzuki reaction between 4-bromotoluene and phenylboronic acid. It was found the polymer particles obtained as a result of the performed polymerization have composite nature and are characterized by a unique multi-hollow morphology with pores up to 50 μm in size. An advantageous effect of the Fe 3 O 4 particles embedded in the synthesized polymer microspheres on the activity of palladium catalysts has been noted.