title: Immobilization of anionic iron(III) porphyrins onto in situ obtained zinc oxide.
abstract: A family of anionic iron(III) porphyrins (FePor) was immobilized onto zinc oxide (ZnO) obtained by the in situ hydrothermal decomposition of zinc hydroxide nitrate, a layered hydroxide salt. The immobilization probably occurred via the interaction between the anionic charges on the porphyrins and the positively charged surface of the ZnO, in slightly acidic to neutral pH. The resulting solids were characterized by transmission electron microscopy (TEM), X-ray powder diffraction (XRDP), Fourier transform infrared spectroscopy (FTIR), electron paramagnetic resonance (EPR), and ultraviolet-visible spectroscopy (UV-Vis) (solid samples), which confirmed the formation of ZnO and the immobilization of the FePor. The prepared materials were employed as catalysts for the heterogeneous catalytic oxidation of cyclooctene, cyclohexane, and n-heptane, using iodosylbenzene as the oxygen donor. Good catalytic results were achieved for all the substrates, and selectivity for the alcohol was verified during the oxidation of alkanes. The reuse capacity of the solid catalyst was also investigated.
authors.affiliation: Universidade Federal do Paraná, Departamento de Química, Laboratório de Bioinorgânica e Catálise e, CP 19081, CEP 81531-980 Curitiba, Paraná, Brazil.
authors.forename: Guilherme S
authors.initials: GS
authors.lastname: Machado
authors.forename: Fernando
authors.initials: F
authors.lastname: Wypych
authors.forename: Shirley
authors.initials: S
authors.lastname: Nakagaki
mesh_terms: D000838:Anions / Q000737:chemistry; D002384:Catalysis; D006878:Hydroxides / Q000737:chemistry; D007501:Iron / Q000737:chemistry*; D008665:Metalloporphyrins / Q000737:chemistry*; D015394:Molecular Structure; D009566:Nitrates / Q000737:chemistry; D010316:Particle Size; D013499:Surface Properties; D015034:Zinc Oxide / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D000838:Anions; D006878:Hydroxides; D008665:Metalloporphyrins; D009566:Nitrates; C554830:zinc hydroxide nitrate; D007501:Iron; D015034:Zinc Oxide