Cluster-Redoxpotentiale: Feineffekte durch Variation von Metallatomen und Liganden / Cluster Redox Potentials: Fine Tuning by Variations of Metal Atoms and Ligands

Influences due to the variations of metal atoms and ligands in organometallic clusters of the EM3 tetrahedrane type have been studied in detail with respect to their electrochemical behaviour. Replacements of metal atoms or of μ3 bridging chalcogen ligands cause rather small effects in the expected directions. The different charge along isoelectronic series of ECo3 +, EFeCo2, EFe2Co- clusters causes drastic changes. 23 mono-, bis-, and tris-isonitrile derivatives of SFeCo2(CO)9 were prepared. The influence of X groups in X-C6H4-NC on the cluster redox potentials is small; it can be expressed by an equation of the Hammett type