Cobalt(II) metallated hematoporphyrin IX and protoporphyrin IX immobilized on niobium(V) oxide grafted on a silica gel surface: electrochemical studies

dc.creatorPessoa, CA
dc.creatorGushikem, Y
dc.date1999
dc.date44501
dc.date2014-12-02T16:26:04Z
dc.date2015-11-26T16:06:45Z
dc.date2014-12-02T16:26:04Z
dc.date2015-11-26T16:06:45Z
dc.date.accessioned2018-03-28T22:55:34Z
dc.date.available2018-03-28T22:55:34Z
dc.identifierJournal Of Electroanalytical Chemistry. Elsevier Science Sa, v. 477, n. 2, n. 158, n. 163, 1999.
dc.identifier0022-0728
dc.identifierWOS:000087762000007
dc.identifier10.1016/S0022-0728(99)00400-3
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/78773
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/78773
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/78773
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1265992
dc.descriptionNiobium oxide thin him grafted on porous silica gel nas prepared and used to immobilize protoporphyrin IX: and hematoporphyrin IX. The porphyrins adhered strongly to the surface probably by the -COO-Nb chemical bond formed between the porphyrin carboxyl groups and Nb2O5. The immobilized hematoporphyrin IX and protoporphyrin IX, SiO2/Nb2O5/H2HMP and SiO2 Nb2O5 H2PP. respectively. were further metallated by means of in situ reaction with CoCl2 giving rise to SiO2/Nb2O5/ CoHMP and SiO2 Nb2O5 CoPP. The effectiveness of the reactions in producing the metallated adsorbed complexes was investigated by electronic absorption spretroscopy. Graphite paste electrodes of the metallated adsorbed porphyrins were prepared In order to study the electrocatalytic reduction of dissolved dioxygen by the cyclic voltammetry technique. The dioxygen eletroreduction was observed at - 0.18 and - 0.16 V versus SCE in pH 6 for hematoporphyrin and protoporphyrin complexes, respectively. The cathodic peak potentials at different solution pH remained practically constant between pH 4 and 7 for both materials. The current intensities for a fixed potential plotted against dissolved dioxygen concentrations showed linear responses between 2 and 12 ppm. (C) 1999 Elsevier Science S.A. All rights reserved.
dc.description477
dc.description2
dc.description158
dc.description163
dc.languageen
dc.publisherElsevier Science Sa
dc.publisherLausanne
dc.publisherSuíça
dc.relationJournal Of Electroanalytical Chemistry
dc.relationJ. Electroanal. Chem.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectsilica gel
dc.subjectniobium(V) oxide
dc.subjecthematoporphyrin IX
dc.subjectprotoporphyrin IX
dc.subjectelectroreduction of dioxygen
dc.subjectStationary Phases
dc.subjectChromatography
dc.subjectExchange
dc.subjectOxygen
dc.titleCobalt(II) metallated hematoporphyrin IX and protoporphyrin IX immobilized on niobium(V) oxide grafted on a silica gel surface: electrochemical studies
dc.typeArtículos de revistas


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