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

Sensors

Serge Cosnier¹  Chantal Gondran¹  Rudolf Wessel¹  Franz-Peter Montforts¹ 

[1]¹Laboratoire d'Electrochimie Organique et de Photochimie Rédox, UMR CNRS 5630, Institut de Chimie Moléculaire de Grenoble, FR CNRS 2607, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France[2] height:6px

[3]"> ²Institut für Organische Chemie, FB 2 Biologie, Chemie der Universität Postfach 330 440, D-28334 Bremen, Germany

关键词: Deuteroporphyrin;    Cobalt;    Polypyrrole;    Modified electrode;    Nitrite;   

DOI  :  10.3390/s30700213

来源: mdpi

【 摘 要 】

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 NO₂^- 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 NO₂^- in the concentration range 2 10^-6- 2.5 10^-4 M.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.