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

Abstract

A ftalocianina de cobalto(II) imobilizada sobre a sílica gel (área superficial SBET = 500 m 2 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 δ = 4,7 x 10

Modification of silica gel by attachment of 2-mercaptobenzimidazole for use in removing Hg(II) from aqueous media: A thermodynamic approach

“…The decrease of the surface area after incorporation of organic groups can be easily explained due to the fact that the presence of pendant group blocks partially the adsorption of nitrogen molecules on the surface, resulting in a decreasing of the surface area [20,21].…”

Electrochemical Applications of Silica-Based Organic−Inorganic Hybrid Materials

“…Kubota, Gushikem and co-workers 71,73,79,81,[86][87][88][89][90][91] have examined the voltammetric response of several catalysts and charge-transfer cofactors (metal phthalocyanines, porphyrins, methylene or Meldola's Blue) adsorbed on silica gels coated with inorganic layers (mainly titanium oxide or titanium phosphate), as a function of various experimental parameters like pH or the nature of the electrolyte. They have recently reported the strong binding of these electroactive species, preventing leaching into the external solution, [86][87][88][89][90][91] and have provided a factorial design optimization by searching the conditions for the best reversibility of the redox processes. 79 The ceramic-carbon composite electrodes (CCEs) and the corresponding metal-doped CCEs were fully characterized by Lev's group (i.e., refs 22, 93-96, and 124).…”

Metallophthalocyanine-based molecular materials as catalysts for electrochemical reactions

“…In the earlier studies, most of the work was focused on the reduction of molecular O 2 but was later shown over the years that they catalyze a myriad of reactions. Some phthalocyanines and related macrocyclic complexes catalyze (i) the electrooxidation of formic acid [8,30], CO [8,[29][30][31][32][33], SO 2 [34][35][36], oxalic acid [37][38][39][40][41][42][43][44][45][46][47][48], glucose [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63], molecular hydrogen [64][65][66][67][68], H 2 O 2 [67][68][69], hydrazine [8,30,47,…”