Electrochemical studies of a new iron porphyrin entrapped in a propylpyridiniumsilsesquioxane polymer immobilized on a SiO2/Al2O3 surface

dc.creatorFujiwara, ST
dc.creatorGushikem, Y
dc.creatorPessoa, CA
dc.creatorNakagaki, S
dc.date2005
dc.dateMAY
dc.date2014-11-18T12:50:43Z
dc.date2015-11-26T16:55:01Z
dc.date2014-11-18T12:50:43Z
dc.date2015-11-26T16:55:01Z
dc.date.accessioned2018-03-28T23:42:17Z
dc.date.available2018-03-28T23:42:17Z
dc.identifierElectroanalysis. Wiley-v C H Verlag Gmbh, v. 17, n. 9, n. 783, n. 788, 2005.
dc.identifier1040-0397
dc.identifierWOS:000229167600009
dc.identifier10.1002/elan.200403153
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/65191
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/65191
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/65191
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1276991
dc.descriptionIn this work, a new porphyrin, the 5,10,15,20-tetrakis-(2,6-difluoro-3-sulfonatophenyl) porphyrinato iron(III) chloride (denoted as FeTsP) was immobilized on SiO2/Al2O3 (SiAl) coated with n-propylpyridiniumsilsesquioxane polymer (SiPy+Cl-). The FeTsP was adsorbed on SiAl/SiPyCl by an ion exchange reaction, obtaining a modified solid, SiAl/ SiPy/FeTsP, where the porphyrin complex was strongly adhered. Cyclic voltammograms of the SiAl/SiPy/FeTsP carbon paste electrode showed an irreversible response, with an oxidation peak at E-Pa=0.40 V and nondefined reduction peak at E-pc = 0.15 V (vs. SCE). These peaks were not observed for the nonmetallated porphyrin, indicating that they probably correspond to the Fe(III)/Fe(II) process. Studies made in solutions having different pH, (between pH 2 and 9) using the modified electrode showed that the peak potentials and the current density were not affect by pH changes, indicating that the iron porphyrin is very stable and strongly entrapped in the matrix. The modified electrode presented the property to electrocatalyze the eletrooxidation of hydrazine at 0.41 V (vs. SCE), at pH 7. The potentiality of the SiAl/SiPy/FeTsP electrode as a sensor for hydrazine was evaluated by the using the chronoamperometric technique. A linear response was obtained in the concentration range between 5 x 10(-5) and 6 x 10(-4) mol L-1 of hydrazine.
dc.description17
dc.description9
dc.description783
dc.description788
dc.languageen
dc.publisherWiley-v C H Verlag Gmbh
dc.publisherWeinheim
dc.publisherAlemanha
dc.relationElectroanalysis
dc.relationElectroanalysis
dc.rightsfechado
dc.rightshttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dc.sourceWeb of Science
dc.subjectiron porphyrin
dc.subjectpropylpyridiniumsilsesquioxane polymer
dc.subjectSiO2/Al2O3
dc.subjectoxidation of hydrazine
dc.subjectcarbon paste electrode
dc.subjectSilica-gel Surface
dc.subjectChloride Silsesquioxane Polymer
dc.subjectChemically Modified Electrodes
dc.subjectCarbon-paste Electrode
dc.subject3-n-propylpyridinium Chloride
dc.subjectCatalytic-oxidation
dc.subjectHydrazine
dc.subjectElectrocatalysis
dc.subjectFilm
dc.subjectMetalloporphyrins
dc.titleElectrochemical studies of a new iron porphyrin entrapped in a propylpyridiniumsilsesquioxane polymer immobilized on a SiO2/Al2O3 surface
dc.typeArtículos de revistas


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