Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/25277
Type: Artigo de periódico
Title: Al2O3 coated with 3-n-propyl-1-azonia-4-azabicyclo[2.2.2]octane silsesquioxane chloride and its use for immobilization of cobalt(II) tetrasulfonated phthalocyanine in oxalic acid electrooxidation
Author: Ramos, André R.
Arguello, Jacqueline
Magosso, Hérica A.
Gushikem, Yoshitaka
Abstract: A water-soluble polymer prepared by sol-gel process, 3-n-propyl-1-azonia-4-azabicyclo[2.2.2]octane silsesquioxane chloride, was adsorbed on alumina surface. This polymer-coated alumina was able to effectively immobilize cobalt(II) tetrasulfonated phthalocyanine complexes as counter ions. Cobalt phthalocyanine immobilized in this way is well and tightly adsorbed on Al2O3/3-n-propyl-1-azonia-4-azabicyclo[2.2.2]octane silsesquioxane chloride surface. Furthermore, when incorporated to a carbon paste electrode showed a good electrocatalytic response toward the acid oxalic oxidation, making it a suitable electrode material. A linear relationship (r = 0.998) between the current responses obtained by chronoamperometric measurements and the oxalic acid concentration in the range of 7.4 × 10-5 - 9.1 × 10-4 mol L-1 was observed. A detection limit of 18 µmol L-1 was also determined.
Um polímero solúvel em água, preparado pelo método sol-gel e designado cloreto de 3-n-propil-1-azonia-4-azabiciclo[2.2.2]octano silsesquioxano, foi adsorvido sobre a superfície da alumina. Essa alumina recoberta com o polímero foi capaz de imobilizar efetivamente complexos de ftalocianina tetrassulfonada metalada com Co(II) como contra-íons. A ftalocianina de cobalto imobilizada dessa forma fica fortemente aderida sobre a superfície do cloreto de Al2O3/3-n-propil-1-azonia-4-azabiciclo[2.2.2]octano silsesquioxano. Além disso, quando incorporada a um eletrodo de pasta de carbono mostra uma boa resposta eletrocatalítica para a oxidação de ácido oxálico. Foi obtida uma relação linear (r = 0,998) para o gráfico de correntes de resposta obtidas por cronoamperometria e a concentração de ácido oxálico na faixa de 7.4 ×10-5 a 9.1 × 10-4 mol L-1. O limite de detecção determinado foi igual a 18 µmol L-1.
Subject: 3-n-propyl-1-azonia-4-azabicyclo[2.2.2]octanesilsesquioxane chloride
cobalt(II) tetrasulfonated phthalocyanine
oxalic acid electrocatalytic oxidation
Editor: Sociedade Brasileira de Química
Rights: aberto
Identifier DOI: 10.1590/S0103-50532008000400020
Address: http://dx.doi.org/10.1590/S0103-50532008000400020
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532008000400020
Date Issue: 1-Jan-2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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