Artículos de revistas
Synthesis Of Fluorinated Metalloporphyrinosilica Imprinted With Templates Through Sol-gel Process
Registro en:
Journal Of Non-crystalline Solids. , v. 273, n. 01/03/15, p. 100 - 108, 2000.
223093
2-s2.0-0001839470
Autor
Ciuffi K.J.
Sacco H.C.
Biazzotto J.C.
Vidoto E.A.
Nascimento O.R.
Leite C.A.P.
Serra O.A.
Iamamoto Y.
Institución
Resumen
We present the synthesis of a hybrid material containing fluorinated iron porphyrins through hydrolysis and polycondensation of iron porphyrin bearing a trifluorosilyl function with tetraethoxysilane in the presence of nitrogen bases acting as template molecules. The presence of metalloporphyrin Soret band is detected in the ultraviolet-visible absorption spectra of all metalloporphyrinosilica-templates. Thermogravimetric analysis and electron paramagnetic resonance of the materials also confirm the presence of metalloporphyrin in a silica network. Electron spectroscopy imaging was that of a non-crystalline microstructure. The iron and silicon distribution are homogeneous for the elements in all particle sites. The iron porphyrinosilicas-template were active as catalysts for cyclooctene epoxidation using iodozylbenzene as oxygen donor. In general, the epoxidation yield is larger for iron porphyrinosilicas-template than for manganese porphyrinosilicas-template. 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