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Reference type: Journal
Authors: Ciuffi KJ, Sacco HC, Biazzotto JC, Vidoto EA, Nascimento OR, Leite CAP, Serra OA, Iamamoto Y
Article Title: Synthesis of fluorinated metalloporphyrinosilica imprinted with templates through sol-gel process.
Publication date: 2000
Journal: Journal of Non-Crystalline Solids
Volume: 273
Issue: (1-3)
Page numbers: 100-108.
DOI: 10.1016/S0022-3093(00)00149-6

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%). (C) 2000 Elsevier Science B.V. All rights reserved


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