INVESTIGADORES
FAGALDE Florencia
artículos
Título:
Dinuclear Asymmetric Ruthenium Complexes with 5-cyano-1,10-phenthroline as a Bridging Ligand
Autor/es:
MELLACE, MARÍA G.; FAGALDE, FLORENCIA; KATZ, NÉSTOR E.; CRIVELLI, IRMA G.; DELGADILLO, ALVARO; LEIVA, ANA MARÍA; LOEB, BÁRBARA; GARLAND, MARÍA TERESA; BAGGIO, RICARDO
Revista:
INORGANIC CHEMISTRY
Editorial:
American Chemical Society
Referencias:
Lugar: Washington D.C , EE.UU; Año: 2004 vol. 43 p. 1100 - 1107
ISSN:
0020-1669
Resumen:
New dinuclear asymmetric ruthenium complexes 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 for the metal-to-metal charge-transfer transition RuII f RuIII in this latter complex, a slight electronic interaction (HAB ) 190 cm-1) is disclosed between both metallic centers through the bridging 5-CNphen.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 for the metal-to-metal charge-transfer transition RuII f RuIII in this latter complex, a slight electronic interaction (HAB ) 190 cm-1) is disclosed between both metallic centers through the bridging 5-CNphen.