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Inicio » Actividades I+D > Publicaciones 2004 > Dinuclear Asymmetric Ruthenium Complexes...
artículo con referato
"Dinuclear Asymmetric Ruthenium Complexes with 5-Cyano-1,10-Phenanthroline as a Bridging Ligand"
M.G. Mellace, F. Fagalde, N.E. Katz, I.G. Crivelli, A. Delgadillo, A.M. Leiva, B. Loeb, M.T. Garland and R.F. Baggio
Inorg. Chem. 43 (2004) 1100-1107
New dinuclear asymmetric complexes of ruthenium of the type : [(bpy)2Ru(5-CNphen)Ru(NH3)5]4+/5+ (bpy = 2,2′-bipyridine; 5-CNphen = 5-cyano-1,10-phenanthroline) have been synthesized and characterized by spectroscopic, electrochemical and photophysical techniques. The structure of the cation [(bpy)2Ru(5-CNphen)Ru(NH3)5]4+ has been determined by X-ray diffraction. The mononuclear precursor [Ru(bpy)2(5-CNphen)]2+ has also been prepared and studied; while its properties as a photosensitizer are similar to those of [Ru(bpy)3]2+, its luminescence at room temperature is quenched by a factor of 5 in the mixed-valent species [(bpy)2RuII(5-CNphen)RuIII(NH3)5]5+, pointing to the occurrence of intramolecular electron transfer processes that follow light excitation. From spectral data of the metal-to-metal charge transfer transition RuII RuIII in this latter complex, a slight electronic interaction (HAB = 190 cm-1) is disclosed between both metallic centers through the bridging 5-CNphen.
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