A poly(pyrrole-Cobalt(II)deuteroporphyrin) electrode for the potentiometric determination of nitrite

Abstract

Abstract:The electrochemical properties of a new Co(II) deuteroporphyrin substituted by two electropolymerizable pyrrole groups has been investigated in organic solvent. This functionalization has allowed the preparation of the first example of a cobalt deuteroporphyrin film by oxidative electropolymerization. The resulting conducting polypyrrole film exhibits the regular electroactivity of cobalt deuteroporphyrin. Compared to conventional cobalt porphyrin electrochemistry, the replacement of porphyrin macrocycle by deuteroporphyrin ring results in markedly more negative potential values for the metalcentered oxidation and reduction processes. The influence of NO 2 -as axial ligand on the reductive behavior of the electropolymerized cobalt (II) deuteroporphyrin is examined. The recognition properties of the film illustrated by the potentiometric shift of the Co(II)/(I) reduction were exploited for the determination of NO 2 -in the concentration range 2 10 -6 -2.5 10 -4 M.

Synthesis and self-assembly of a novel cobalt(II) porphyrin lipoic acid derivative on gold

“…Notwithstanding, one can detect some of the typical processes of synthetic metalloporphyrin and of the precursor 4; Table 2 shows the potential values for the oxidation and reduction peaks revealed in Figs 2 and 3. The assignment of the peaks was performed in agreement to previous studies involving the electrochemical characterization of synthetic metalloporphyrins [17,18]. It can be observed that both the porphyrin ring and the cobalt centre are still electrochemically active upon immobilization through the dithiolane functionalities.…”

An Iron Impurity in Multiwalled Carbon Nanotube Complexes with Chitosan that Biomimics the Heme‐Peroxidase Function

“…e Unfortunately, most of the existing compounds do not fulfill all the four biomimetic criteria. For instance, metal porphyrins and hemin have less selectivity because the compounds can also mediate other biochemicals such as nitrite, catechol, and dopamine 10a–c. Prussian blue analogues shows less stability in neutral pH 11a–d.…”

Synthesis of Polypyrrole Using Ferric Chloride (FeCl<sub>3</sub>) as Oxidant Together with Some Dopants for Use in Gas Sensors

“…Electroactive conducting polymers have assumed a great importance in several technologies such as Display devices, Solar cells, Gas sensors and Actuators [1][2][3]. Their ease of processing together with their chemically tunable properties makes them useful in electro-mechanical devices.…”