A glassy carbon electrode modified by a copolymer of Co-tetrakis (para-aminophenyl)porphyrin and ortho-phenylenediamine. Characterization and electrocatalytic sulfite oxidation behavior of a basic extract from red wine

A glassy carbon electrode modified by a triply-fused-like Co(ii) polyporphine and its ability for sulphite oxidation and detection

“…This value is nearly in the same range as with a Co(II) porphyrin based similar system in conditions similar to ours and for which the LOD was found equal to 0.385 mM. 31 In any case, this result, which has still to be optimized, demonstrates the ability of our system for sensing sulphite in water.…”

“…In our case, the occurrence of two signals, e. g. O1(S) and O2(S), is quite surprising since just one is generally observed for this sole electrode reaction. 31 Indeed, at the working pH (≈ 9.7), sulphite exists exclusively under the form of SO3 2-. 2,9,10 In order to elucidate this particular feature other conditions were tested for the voltammetric analysis.…”

“…Porphyrin based materials are adequate for catalyzing sulphite oxidation, [28][29][30] especially in the Co(II) complex form. 31,32 In the reported studies, the catalytically active porphyrin molecule is dispersed in solution, 31 or deposited on the electrode surface, through drop casting, 29,30 or by electropolymerization. [30][31][32][33] In this last case, a polymerizable function must be implanted at the periphery of the macrocycle at the stage of the monomer.…”

“…31,32 In the reported studies, the catalytically active porphyrin molecule is dispersed in solution, 31 or deposited on the electrode surface, through drop casting, 29,30 or by electropolymerization. [30][31][32][33] In this last case, a polymerizable function must be implanted at the periphery of the macrocycle at the stage of the monomer. The resulting molecule is more voluminous thus causing a limitation in density of catalytical sites of the ultimate material which can be detrimental to sensitivity.…”

Electropolymerization of Metallophthalocyanines Carrying Redox Active Metal Centers and their Electrochemical Pesticide Sensing Application

“…In order to prepare modified electrodes with electropolymerization reaction, MPcs were decorated with electropolymerizable 5‐{[(1 E )‐(4‐morpholin‐4‐ylphenyl)methylene]amino}‐1‐naphthoxy (MOR‐NAF) substituents. Since amino and morpholine groups of the substituents trigger coating of the complexes with oxidative electropolymerization and naphthalene groups enhance the solubility of the complexes in various solutions. Before the electropolymerization reactions, the electrochemical characterizations were carried out to illustrate the redox functionality of the complexes.…”