Characterization of polymeric film of a new manganese phthalocyanine complex octa-substituted with 2-diethylaminoethanethiol, and its use for the electrochemical detection of bentazon

Remarkable sensitivity for detection of bisphenol A on a gold electrode modified with nickel tetraamino phthalocyanine containing Ni–O–Ni bridges

“…The behaviour of poly-70-Ni(OH)NiTAPc and poly-90-Ni(OH)NiTAPc implies that film thickness in this case does not necessarily mean less charge transfer resistance or better catalytic activity as reported before [31]. The general decrease in R CT values with film thickness could be attributed to the catalytic nature of the surface confined polymer films as has been observed before [39,40]. This behaviour may be a result of decreased electrical resistance to mass transport through the film thickness.…”

Electrochemical Determination of the Herbicide Bentazone Using a Carbon Nanotube β‐Cyclodextrin Modified Electrode

“…The method based on a bare GC electrode showed a higher detection limit, 10 mM, and a narrower linear range, 15.1-22.6 mM, than that obtained in the present study. A polymeric film of a new manganese phthalocyanine complex octa-substituted with 2-diethylaminoethanethiol [20] had an analytical sensitivity of 0.288 mA cm À2 mM À1 , higher than the 0.106 mA cm À2 mM À1 found here using the PANI-b-CD/fMWCNT film electrode. However, for the PANI-b-CD/fMWCNT film electrode, good reproducibility and simple instrumentation, preparation and analytical procedure are important advantages.…”

“…Analyzing the data obtained and those reported in the literature it is plausible that the bentazone oxidation process proceeds at the nitrogen of the tertiary amine [18,20]. The higher electron density of the lone pair of the nitrogen of the tertiary amine group makes it susceptible to oxidation, meaning that it is likely that the reaction mechanism corresponds to a fast one-electron transfer followed by a slow chemical step, probably a dimerization of the oxidation product [18,20].…”

“…Extensive adsorption of the products formed during the oxidation of bentazone causes severe poisoning of the bare electrode surface, limiting its use [18]. The use of carbon paste electrode bulk-modified with polyaniline and polypyrrole conducting polymers, and a polymeric film of a manganese phthalocyanine complex, formed on a glassy carbon electrode, have also been reported [19,20].…”

The effects of point of substitution on the electrochemical behavior of new manganese phthalocyanines, tetra-substituted with diethylaminoethanethiol

“…MnPc complexes show interesting electrochemical behavior with oxidation states of the central Mn ion ranging from Mn I to Mn IV [6][7][8][9][10][11][12][13][14][15][16]. Mn IV Pc species rarely occurs, but has been reported recently [11,12].…”