title: Metalloporphyrins immobilized in Fe3O4@SiO2 mesoporous submicrospheres: Reusable biomimetic catalysts for hydrocarbon oxidation.
abstract: We successfully immobilized metalloporphyrins (MeP) in mesoporous silica coating magnetite spheres. In this sense, we prepared two different classes of core@shell supports, which comprise aligned (Fe3O4-AM-MeP, MeP=FeP or MnP) and non-aligned (Fe3O4-NM-MeP, MeP=FeP or MnP) mesoporous magnetic structures. X-ray diffractometry and energy dispersive X-ray spectroscopy confirmed the mesoporous nature of the silica shell of the materials. Magnetization measurements, scanning and transmission electron microscopies (SEM/TEM), electrophoretic mobility (ζ-potential), and infrared spectroscopy (FTIR) also confirm the composition and structure of the materials. The catalysts maintained their catalytic activity during nine reaction cycles toward hydrocarbon oxidation processes without detectable catalyst leaching. The catalysis results revealed a biomimetic pattern of cytochrome P450-type enzymes, thus confirming that the prepared materials are can effectively mimic the activity of such groups.
authors.affiliation: Bioinorganic Chemistry and Rare Earth Laboratories, Department of Chemistry, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, 14040-901 Ribeirão Preto, SP, Brazil.
authors.forename: Isaltino A
authors.initials: IA
authors.lastname: Barbosa
authors.affiliation: Bioinorganic Chemistry and Rare Earth Laboratories, Department of Chemistry, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, 14040-901 Ribeirão Preto, SP, Brazil.
authors.forename: Paulo C
authors.initials: PC
authors.lastname: de Sousa Filho
authors.affiliation: Bioinorganic Chemistry and Rare Earth Laboratories, Department of Chemistry, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, 14040-901 Ribeirão Preto, SP, Brazil.
authors.forename: Douglas L
authors.initials: DL
authors.lastname: da Silva
authors.affiliation: Bioinorganic Chemistry and Rare Earth Laboratories, Department of Chemistry, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, 14040-901 Ribeirão Preto, SP, Brazil.
authors.forename: Fabrício B
authors.initials: FB
authors.lastname: Zanardi
authors.affiliation: Bioinorganic Chemistry and Rare Earth Laboratories, Department of Chemistry, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, 14040-901 Ribeirão Preto, SP, Brazil.
authors.forename: Lucas D
authors.initials: LD
authors.lastname: Zanatta
authors.affiliation: Department of Physics, Federal University of São Carlos, Av. Trabalhador São-Carlense, 400 - Pq. Arnold Schimidt, 13566-590 São Carlos, SP, Brazil.
authors.forename: Adilson J A
authors.initials: AJA
authors.lastname: de Oliveira
authors.affiliation: Bioinorganic Chemistry and Rare Earth Laboratories, Department of Chemistry, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, 14040-901 Ribeirão Preto, SP, Brazil.
authors.forename: Osvaldo A
authors.initials: OA
authors.lastname: Serra
authors.affiliation: Bioinorganic Chemistry and Rare Earth Laboratories, Department of Chemistry, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, 14040-901 Ribeirão Preto, SP, Brazil. Electronic address: iamamoto@usp.br.
authors.forename: Yassuko
authors.initials: Y
authors.lastname: Iamamoto
mesh_terms: D040761:Biomimetic Materials / Q000737:chemistry*; D002384:Catalysis; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D006838:Hydrocarbons / Q000737:chemistry*; D008665:Metalloporphyrins / Q000737:chemistry*; D008863:Microspheres; D015394:Molecular Structure; D010084:Oxidation-Reduction; D010316:Particle Size; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D006838:Hydrocarbons; D008665:Metalloporphyrins; D012822:Silicon Dioxide; D052203:Ferrosoferric Oxide
keywords: Biomimetic catalysis; Core@shell structures; Magnetite particles; Mesoporous structures; Porphyrins