The electrochemical behavior of the face-coordinated C60-carbidopentaruthenium cluster complexes Ru5C(CO)11(PPh3(μ3-η2 ,η2,η2-C60 (1) Ru5C(CO)10(μ-η1,η1-dppf)( μ3-η2,η2,η2-C60 ) (2) (dppf = 1,1′-bis(diphenylphosphino)ferrocene), and PtRu5C(CO)11(η2-dppe)(μ3- η2,η2,η2-C60) (3) (dppe = 1,2-bis(diphenylphosphino)ethane) has been examined by cyclic voltammetry, rotating disk electrode voltammetry, and differential pulse voltammetry methods. The behavior of compounds Ru5C(CO)15 (4), Ru5C(CO)14(PPh3) (5), Ru5C(CO)13(μ-η1,η1-dppf) (6), PtRu5C(CO)16 (7), and PtRu5C(CO)14(η2-dppe) (8) was studied also for comparison. For both 1 and 3, the voltammetric scans show an initial irreversible two-electron reduction feature, followed by three quasi-reversible, one-electron reductions of the C60 ligand. In contrast, similar scans for 2 indicate an initial quasi-reversible, one-electron reduction of the C60 ligand that is dynamically coupled with a second one-electron, irreversible reduction. Stepwise reduction of the C60 ligand proceeds at more negative potentials. Interpretation of the electrochemical behavior of compounds 1-8 has been enhanced by studying their chemical reduction with cobaltocene. In all cases uptake of two electrons results in irreversible loss of a CO ligand from the cluster, and the resulting dianionic complexes have been characterized by their IR (νCO) spectra.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry