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Co-Phthalocyanine complex was immobilized on 3-n-propylimidazole groups grafted on a porous SiO2 surface (specific surface area S BET = 500 m² g-1) and efficiently electrocatalyzed the oxalic acid oxidation on a carbon paste electrode surface made of this material. Intermolecular interactions of the complex species which can normally interfere in the redox process practically are not observed in the present case because of a low average surface density, delta = 4.7 x 10-13 mol cm-2 (delta = Nf/S BET, where Nf is the amount of adsorbed Co-phtalocyanine per gram of modified silica gel) of the complex species material prepared. The linear response of the electrode to oxalic acid concentration, between 6.5 x 10-4 and 3.2 x 10-3 mol L-1, associated with its high chemical stability makes the covalently immobilized Co-phtalocyanine complex material very attractive in preparing a new class of chemical sensors.A ftalocianina de cobalto(II) imobilizada sobre a sílica gel (área superficial S BET = 500 m² g-1) modificada com 3-n-propilimidazol, foi incorporada a um eletrodo de pasta de carbono e mostrou-se eficiente na eletrocatálise da oxidação do ácido oxálico. As interações intermoleculares do complexo, as quais podem normalmente interferir no processo redox, praticamente não foram observadas no presente caso, devido a baixa densidade média do complexo na superfície do material sintetizado delta = 4,7 x 10-13 mol cm-2 (delta= Nf/S BET, onde Nf é a quantidade de Co-Ftalocianina adsorvida por grama de silica gel modificada ). A resposta linear do eletrodo para concentrações do ácido oxálico entre 6,5 x 10-4 e 3,2 x 10-3 mol L-1, associado com sua alta estabilidade química tornam o material com a ftalocianina de cobalto(II) ligado covalentemente muito atrativo na preparação de uma nova classe de sensores químicos

Cobalt(II) phthalocyanine bonded to 3-n-propylimidazole immobilized on silica gel surface: preparation and electrochemical properties