Electrochemically driven introduction of copper ions into the ring of 5,10,15,20-tetraphenyl-21H, 23H-porphyrin mechanically attached as solid microparticles to a graphite electrode

Abstract

<jats:p> Upon cyclic electrochemical polarization, traces of 5,10,15,20-tetraphenyl-21H,23H-porphyrin (H<jats:sub>2</jats:sub>TPP), which have been mechanically transferred to the surface of a paraffin-impregnated graphite electrode, incorporate copper ions from aqueous solution into the porphyrin ring to form CuTPP . The mechanism of formation of copper porphyrin and the catalytic action of the latter on the electroreduction of oxygen were studied by cyclic voltammetry and square-wave voltammetry. In solid CuTPP the Cu <jats:sup>II</jats:sup>/ Cu <jats:sup>I</jats:sup> system is electrochemically active according to the following insertion electrochemical reaction: [Formula: see text]. When the CuTPP is dissolved in organic solvents, the central copper ion does not show any electrochemical activity in the accessible potential range. </jats:p>

Selective Sensing of Copper Ions by Mesoporous Porphyrinic Metal–Organic Framework Nanoovals

“…At such low potential (−0.07 V), only Cu 2+ can be reduced by the PCN222-based sensor. It is consistent with the literature. − …”