Abstract

The electrochemical behavior of a series of five cationic species containing the Au(bipy)³⁺ moiety and additional oxygen-donor ligands, and of the relevant common precursor, i.e. the dichloride [Au(bipy)Cl₂][PF₆] species, have been investigated using cyclic voltammetry and controlled-potential coulometry. All the compounds with oxygen-containing ligand(s) (2–6) undergo an easy, irreversible one-electron reduction process. The first reduction process of the dichloride consists of an equally easy but quasi-reversible charge transfer, as evidenced by voltammetric tests at a very high scan rate, followed by an irreversible second-order chemical reaction. Correlations between the relative values of the reduction potentials and the corresponding molecular structure are made and hypotheses on the nature of the reduction mechanisms are advanced.

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