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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, CA
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 get 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 (a(2u) --> e(g) transition) after the metallation, indicating that the symmetry of the porphyrin ring changed from D-2h to D-4h 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 X 10(-5) and 5 x 10(-4) mol L-1 at pH 7.
Subject: porphyrin
modified electrode
carbon paste
Country: Alemanha
Editor: Wiley-v C H Verlag Gmbh
Citation: Electroanalysis. Wiley-v C H Verlag Gmbh, v. 14, n. 15-16, n. 1072, n. 1076, 2002.
Rights: fechado
Identifier DOI: 10.1002/1521-4109(200208)14:15/16<1072
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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