Redox properties of copper tetra(4-N,N′,N″-trimethylanilinium)porphyrin. Electrochemical and spectral studies

Armand Bettelheim, Dan Ozer, Rachel Harth

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The redox behaviour of the copper tetra(4-N,N′,N″-trimethylanilinium)porphyrin (abbreviated as CuTMAP) has been studied in acetonitrile and aqueous solutions using differential pulse polarography, cyclic voltammetry, a rotating ring-disc electrode and spectroelectrochemical methods. The reduction of CuII is characterized by a two-step one-electron reduction. The CuII/CuITMAP and CuII/CuIIITMAP couples show reversible redox behaviour in acetonitrile and have redox potentials of -0.18 and +0.45 V, respectively. In aqueous solutions and at low concentrations, the CuIITMAP complex is characterized by a Soret band at 412 nm and is reduced at (-0.56-0.057 pH) V, while a band in the 393-398 nm range and a reduction peak at (-0.79-0.057 pH) V predominate at high CuTMAP concentrations. E1/2 for the oxidation of CuIITMAP is +0.87 V in aqueous solutions and is independent of pH. The decomposition of water is described in terms of a catalytic cycle which involves the CuIIITMAP complex.

Original languageEnglish
Pages (from-to)1577-1587
Number of pages11
JournalPhysical Chemistry Chemical Physics
Volume81
Issue number7
DOIs
StatePublished - 1 Dec 1985
Externally publishedYes

Fingerprint

Dive into the research topics of 'Redox properties of copper tetra(4-N,N′,N″-trimethylanilinium)porphyrin. Electrochemical and spectral studies'. Together they form a unique fingerprint.

Cite this