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The preparation and characterization by spectroscopic and electrochemical techniques of new dinuclear complexes of the type [(tpm)(bpy)RuII(L)RuII/III(NH3)5]4+/5+ (bpy = 2,2′-bipyridine), tpm = tris(1-pyrazolyl)methane, L = pz (pyrazine), 4,4′-bpy (4,4′-bipyridine), BPE (trans -1,2-bis(4-pyridyl)ethylene) and PCA (= 4-pyridinecarboxaldehyde azine), are described in this work. The analysis of the visible spectral data for the metal-to-metal charge transfer (MMCT) bands in the corresponding mixed-valent species (Rub = Ru bonded to bpy; Rua = Ru bonded to NH3) allows the determination of the reorganization energies λ and electronic coupling elements H AB for the intramolecular electron transfers
mediated by L. An increased transmission of the metal-to-metal electronic interaction is disclosed for this series, when comparing the distance dependence of HAB to that of the analogous series with trpy (2,2′:6′,2″-terpyridine) acting as a spectator ligand instead of tpm.
F. Fagalde, M. E. García Posse, M. M. Vergara, M. Cattaneo, N. E. Katz, I. Romero, T. Parella, A. Llobet
Polyhedron 2007, 26, 17-23
DOI:
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