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Metaloporphyrins immobilized into Fe3O4@SiO2 magnetic nanocomposites: synthesis, characterization and biomimetic catalysis

Grant number: 11/14665-9
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): November 01, 2011
Effective date (End): October 31, 2012
Field of knowledge:Physical Sciences and Mathematics - Chemistry
Principal Investigator:Yassuko Iamamoto
Grantee:Fabrício Bortulucci Zanardi
Home Institution: Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto (FFCLRP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil

Abstract

This project has the general aims the synthesis and characterization of catalysts that consist of metalloporphyrins (MeP) immobilized in silica matrixes. In this work regular nanospheres of nanocomposites (Fe3O4@nSiO2) will be simultaneously, functionalized with MePs and coated with a mesoporous and structured layer, in order to obtain the catalyst Fe3O4@nSiO2@mSiO2-MeP. This mesoporous layer will be obtained with using the surfactant cetyltrimethylammonium bromide (CTAB) forming channels perpendicularly oriented. The catalyst will be characterized through infrared and ultraviolet-visible absorption spectroscopy, diffuse reflectance spectroscopy, X-ray diffractometry, N2 adsorption-desorption isotherms, electron microscopy (scanning and transmission), and thermal analysis.The material will be assessed in oxidation of (Z)-ciclooctene, ciclohexane using PhIO and H2O2 as oxidant, in order to understand the oxidatives processes and to relate with the morphological and structural properties such as the nature of FeP active site microenvironment and the accessibility of the substrate to this catalytic active site. It is also intended to do preliminary studies of metabolism of the drug Mirtazapine (MTZ), an antidepressant, aiming to understand the catalytical biomimetical oxidative processes of FeP in solution and as Fe3O4@nSiO2@mSiO2-FeP.