Preparation of Nitrogen Rich Magnetic Nanocomposite for Immobilization of Transition Metals and Investigation of their Catalytic Activity in Organic Reactions

Keshavarzi, Nahid | 2019

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 52891 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Pourjavadi, Ali; Matloubi, Firouz
  7. Abstract:
  8. In this thesis, heterogeneous magnetic catalysts immobilize have been designed and synthesized in a triazine polymer support. Triazine polymeric support increases the amount of nitrogen due to their high levels of nitrogen, which in turn reduces the amount of catalyst consumed and reduces metal waste and increases catalyst activate. Melamine and TCT from the triazine family are used because of the ability to form hydrogen bonds, chelate with metals, and the interaction of π-π as an appropriate ligand for stabilizing metals on substrates. In this thesis, various nitrogen-rich polymers based on triazines in the presence of magnetic nanoparticles coated with silica and their compositions with metals such as nickel, gold, and copper were prepared.The catalysts based on triazine compounds have been identified by FT-IR, TGA, SEM, TEM, BET, VSM, AAS, XRD and EDX analyzes. The catalysts based on triazine compounds increased the loading rate of nickel, gold and copper from (1.2 to 0.76 mmol g-1) due to the presence of numerous nitrogen functional groups in the polymer structure. The synthetic catalysts showed a surface area of up to 279.48 and 302 m2 /g. The activity catalytic of the prepared catalyst was used for variety of coupling reactions, reduction of nitro compound and bromination of aromatic compounds. The catalysts exhibit good chemical and thermal stability (up to 600 ° C). The catalyst could be recovered in a facile manner from the reaction mixture and recycled several times without any significant loss of catalytic activity
  9. Keywords:
  10. Triazins ; Transition Metals ; Organic Reactions ; Magnetic Nanodot ; Supported Heterogeneous Catalysts

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