Synthesis and characterization of molybdenum (VI) complex immobilized on polymeric Schiff base-coated magnetic nanoparticles as an efficient and retrievable nanocatalyst in olefin epoxidation reactions

Mortazavi Manesh, A ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1002/aoc.5410
  3. Publisher: John Wiley and Sons Ltd , 2020
  4. Abstract:
  5. In this study, a new polymeric functionalized magnetic nanocatalyst containing a molybdenum Schiff base complex was prepared using a few consecutive steps. Poly (methylacrylate)-coated magnetic nanoparticles were synthesized via radical polymerization of methyl acrylate onto modified magnetic nanoparticles followed by the amidation of the methyl ester groups with hydrazine. Polymeric functionalization efficiently provides the advantage that more catalytic units can be grafted on the surface of magnetic nanoparticles. The functionalization process was continued with salicylaldehyde which introduced Schiff base groups on to the surface of the polymeric support. In the final step, the desired catalytic system was prepared via complexation of the Schiff base groups with MoO2(acac)2. The resulting nanoparticles were characterized by infrared spectroscopy, powder X-ray diffraction, scanning and transmission electron microscopy, elemental analysis, inductively coupled plasma optical emission spectrometry, vibrating sample magnetometry and thermogravimetric analysis. This heterogenized catalytic system was also found to be highly active, sustainable and recyclable nanocatalyst in alkene epoxidation. Eventually, the attractive features of the synthesized catalyst such as simple work-up, good stability, magnetic separation, high TOF and high surface area; make it appropriate for oxidation reactions. © 2019 John Wiley & Sons, Ltd
  6. Keywords:
  7. Immobilization ; Magnetically separable nanocatalyst ; Polymer coated magnetic nanoparticles ; Acrylic monomers ; Complexation ; Epoxidation ; High resolution transmission electron microscopy ; Inductively coupled plasma ; Infrared spectroscopy ; Magnetic separation ; Molybdenum ; Molybdenum oxide ; Nanocatalysts ; Nanomagnetics ; Nanoparticles ; Nitrogen compounds ; Olefins ; Optical emission spectroscopy ; Polymethyl methacrylates ; Radioactive waste vitrification ; Scanning electron microscopy ; Spectrometry ; Thermogravimetric analysis ; Functionalization process ; Inductively coupled plasma-optical emission spectrometry ; Magnetic nano-particles ; Nano-catalyst ; Powder X ray diffraction ; Scanning and transmission electron microscopy ; Synthesis and characterizations ; Vibrating sample magnetometry ; Synthesis (chemical)
  8. Source: Applied Organometallic Chemistry ; Volume 34, Issue 3 , 2020
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/aoc.5410