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Electrochemistry of transition metal complex catalysts

2004; Elsevier BV; Volume: 49; Issue: 22-23 Linguagem: Inglês

10.1016/j.electacta.2003.11.038

1873-3859

Filip Novák, Bernd Speiser, Hani A. Y. Mohammad, Hermann A. Mayer,

CO2 Reduction Techniques and Catalysts

Abstract The electrochemical properties of a promising catalyst for CH bond activation are investigated. This P–C–P-pincer complex of iridium exhibits an intramolecular CH oxidative addition at room temperature, which becomes enhanced upon oxidation. The reaction product is detected by cyclic voltammetry. Mechanistic, kinetic, and thermodynamic information is extracted from experiments in combination with digital simulation. Multicycle voltammograms and voltammograms of mixtures consistently suggest an extended square scheme as the electrode reaction mechanism. The unsubstituted parent compound shows a more complex redox behavior including a coupled ECE sequence. Intermolecular CH activation by reaction of the complex in the presence of cyclooctane is indicated by characteristic changes in the cyclic voltammograms.