Electron-, proton-, and photon-induced spectroscopic changes in chromophore-quencher tricarbonyl(2,2'-bipyridine)rhenium(I) complexes with 4,4'-azobis(pyridine)
| Autor: | Xavier Fontrodona, Isabel Romero, Gaston Pourrieux, Néstor E. Katz, Florencia Fagalde, Teodor Parella |
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| Rok vydání: | 2010 |
| Předmět: |
Photo-induced
Models Molecular Light Pyridines Molecular Conformation chemistry.chemical_element Protonation Electrons Photochemistry Crystallography X-Ray Ligands 4 4'-azobis(pyridine) 2 2'-Bipyridine Inorganic Chemistry chemistry.chemical_compound Bipyridine Trans-cis photoisomerization Pyridine Electrochemistry Organometallic Compounds Computer Simulation Physical and Theoretical Chemistry Rhenium(I) complexes Photons Otras Ciencias Químicas Ciencias Químicas Chromophore Rhenium Crystallography chemistry Models Chemical Excited state Luminescence Azo Compounds Oxidation-Reduction CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | Inorganic chemistry. 49(9) |
| ISSN: | 1520-510X |
| Popis: | We report in this work the synthesis and characterization of new mono- and dinuclear complexes of formulas: [Re(bpy)(CO)3(4,4′-azpy)] (CF3SO3), 1 (bpy = 2,2′-bipyridine, 4,4′-azpy = 4,4′-azobis(pyridine)); [(bpy)(CO)3Re(4,4′-azpy) Ru(NH3)5](PF6)3.CH 3CN•6H2O, 2 and the heterodinuclear species [(bpy)(CO)3Re(4,4′-azpy)Ru(NH3)5] 4+, 3 (obtained in situ by electrochemical oxidation of 2). The molecular structure of 1 has been determined by X-ray diffraction. We also report the effect of controlled potential electrolysis, protonation, and light excitation on the absorption and emission properties of these complexes. In particular, complex 1, which is almost non-emissive at room temperature, recovers luminescence either by reduction of coordinated 4,4′-azpy or by trans- to cis-photoisomerization. The detected emission of 1 at 77 K is due to decay from a Re→ bpy metal-to-ligand charge transfer excited state. Time dependent density functional theory calculations support the interpretation of the photophysical changes induced by external stimuli. Fil: Pourrieux, Gaston. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Química del Noroeste. Universidad Nacional de Tucumán. Facultad de Bioquímica, Química y Farmacia. Instituto de Química del Noroeste; Argentina Fil: Fagalde, Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Química del Noroeste. Universidad Nacional de Tucumán. Facultad de Bioquímica, Química y Farmacia. Instituto de Química del Noroeste; Argentina Fil: Romero, María Isabel. Universidad de Girona; España Fil: Fontrodona, Xaxier. Universidad de Girona; España Fil: Parella, Teodor. Universitat Autònoma de Barcelona; España Fil: Katz, Néstor Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Química del Noroeste. Universidad Nacional de Tucumán. Facultad de Bioquímica, Química y Farmacia. Instituto de Química del Noroeste; Argentina |
| Databáze: | OpenAIRE |
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