Al(2)O(3) 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

作者：Ramos Andre R; Arguello Jacqueline; Magosso Herica A; Gushikem Yoshitaka^*

来源：Journal of the Brazilian Chemical Society, 2008, 19(4): 755-761.

DOI：10.1590/S0103-50532008000400020

• 3-n-propyl-1-azonia-4-azabicyclo[2.2.2]octanesilsesquioxane chloride
• cobalt(II) tetrasulfonated phthalocyanine
• oxalic acid electrocatalytic oxidation

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 Al(2)O(3)/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 x 10(-5) - 9.1 x 10(-4) mol L(-1) was observed. A detection limit of 18 mu mol L(-1) was also determined.

• 出版日期2008