Abstract
Abstract The reaction of Ru(bpy)2(PPh3)(CF3SO3), Ru(bpy)(PPh3)2(CF3SO3)2 or Ru(bpy)2(CF3SO3)2 with mono- or di-carboxylate ligands in the presence of triethylamine afforded the heterometallic Ru(II) and Fe(II) complexes [Ru(bpy)(PPh3)2(η2-O2CFc)](CF3SO3) (1), [Ru(bpy)2(PPh3)(O2CFc)](CF3SO3) (2), [Ru(bpy)2(η2-O2CFc)](CF3SO3) (3) and [{Ru(bpy)2(PPh3)}2{O2CFcCO2}](CF3SO3)2 (4). The molecular structures of complexes 1 and 2 have been determined by single-crystal X-ray diffraction analysis and show that the ruthenium units are coordinated by the ferrocene carboxylate ligand in a monodentate mode or a bidentate-chelating mode. Electrochemical studies reveal that complexes 1, 2, 3 and 4 contain reversible or quasi-reversible Ru and Fe oxidation waves. The redox potentials have been well ascribed. By comparing the coordination environment of the central ruthenium atoms, we found that the RuII/RuIII redox potential shifted to the negative direction along with the increase of electron-deficient bpy ligands. The redox potentials for the ferrocenecarboxylate ligand ranged from +0.5 to +0.6 V.
Published Version
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