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Type: Artigo de periódico
Title: Cobalt Porphyrin Immobilized On A Niobium(v) Oxide Grafted - Silica Gel Surface: Study Of The Catalytic Oxidation Of Hydrazine
Author: Pessoa C.A.
Gushikem Y.
Nakagaki S.
Abstract: meso-Tetracarboxyphenylporphyrin (4,4′,4″,4‴(21H-23H-Porphine-5,10,15,20-tetrayl) tetrakis-(benzoic acid)), designated as H2TCPP, was efficiently immobilized onto niobium oxide grafted on the silica gel surface, SiO2/Nb2O5, by the -COO-Nb bond formed between the porphyrin carboxyl groups and Nb2O5. This immobilized porphyrin, SiO2/Nb2O5/H2TCPP, was then in situ metallated with Co(II) in dimethylformamide solution. The metallation process was followed by inspection of the UV-vis spectra which showed a decrease in the number of Q bands (a2u → eg transition) after the metallation, indicating that the symmetry of the porphyrin ring changed from D2h to D4h upon incorporation of Co(II). This material, when incorporated into a carbon paste electrode, electrocatalyzed hydrazine oxidation. Amperometric studies showed the potential of the modified electrode as a sensor for determination of hydrazine. The response time of the modified electrode was less than 1 s. A linear response was obtained between 1 × 10-5 and 5 × 10-4 mol L-1 at pH 7.
Rights: fechado
Identifier DOI: 10.1002/1521-4109(200208)14:15/16<1072::AID-ELAN1072>3.0.CO;2-X
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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