Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/107419
Type: Artigo de periódico
Title: Synthesis Of Fluorinated Metalloporphyrinosilica Imprinted With Templates Through Sol-gel Process
Author: Ciuffi K.J.
Sacco H.C.
Biazzotto J.C.
Vidoto E.A.
Nascimento O.R.
Leite C.A.P.
Serra O.A.
Iamamoto Y.
Abstract: 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. The manganese porphyrinosilicas-template had a smaller activity due to their manganese oxidation state. The largest catalytic yield were obtained with the iron porphyrinosilica-pyridine (85%). © 2000 Elsevier Science B.V. All rights reserved.
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Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0001839470&partnerID=40&md5=42470ea995fcbc7c7ce62c03aea67d5d
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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