Mechanism of Ligand Photodissociation in Photoactivable [Ru(bpy)L] Complexes: A Density Functional Theory Study.

A series of four photodissociable Ru polypyridyl complexes of general formula [Ru(bpy)L], where bpy = 2,2′-bipyridine and L = 4-aminopyridine (1), pyridine (2), butylamine (3), and γ-aminobutyric acid (4), was studied by density functional theory (DFT) and time-dependent density functional theory (T...

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Publicado en:Journal of the American Chemical Society Vol. 130; no. 29; pp. 9590 - 9598
Autores principales: Salassa, Luca, Garino, Claudio, Salassa, Giovanni, Gobetto, Roberto, Nervi, Carlo
Formato: Artículo
Publicado: American Chemical Society 7/23/2008
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Acceso en línea:Ver este registro en EBSCOhost
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      dt: 7/23/2008
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      pub: American Chemical Society
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        33769163
        10.1021/ja8025906
      ppf: 9590
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        atl: Mechanism of Ligand Photodissociation in Photoactivable [Ru(bpy)L] Complexes: A Density Functional Theory Study.
      aug:
        au:
          Salassa, Luca
          Garino, Claudio
          Salassa, Giovanni
          Gobetto, Roberto
          Nervi, Carlo
        affil: Dipartimento di Clinica I.F.M., Università di Torino, Via P. Giuria 7, 1-10125 Torino, italy
      su:
        Ruthenium compounds
        Ligands (Chemistry)
        Dissociation (Chemistry)
        Photochemistry
        Density functionals
      sug:
        subj:
          Ruthenium compounds
          Ligands (Chemistry)
          Dissociation (Chemistry)
          Photochemistry
          Density functionals
      ab: A series of four photodissociable Ru polypyridyl complexes of general formula [Ru(bpy)L], where bpy = 2,2′-bipyridine and L = 4-aminopyridine (1), pyridine (2), butylamine (3), and γ-aminobutyric acid (4), was studied by density functional theory (DFT) and time-dependent density functional theory (TDDFT). DFT calculations (B3LYP/LanL2DZ) were able to predict and elucidate singlet and triplet excited-state properties of 1-4 and describe the photodissociation mechanism of one monodentate ligand. All derivatives display a Ru → bpy metal-to-ligand charge transfer (MLCT) absorption band in the visible spectrum and a corresponding emitting triplet ³MLCT state (Ru → bpy). 1-4 have three singlet metal-centered (MC) states 0.4 eV above the major ¹MLCT states. The energy gap between the MC states and lower-energy MLCT states is significantly diminished by intersystem crossing and consequent triplet formation. Relaxed potential energy surface scans along the Ru-L stretching coordinate were performed on singlet and triplet excited states for all derivatives employing DFT and TDDFT. Excited-state evolution along the reaction coordinate allowed identification and characterization of the triplet state responsible for the photodissociation process in 1-4; moreover, calculation showed that no singlet state is able to cause dissociation of monodentate ligands. Two antibonding MC orbitals contribute to the ³MC state responsible for the release of one of the two monodentate ligands in each complex. Comparison of theoretical triplet excited-state energy diagrams from TDDFT and unrestricted Kohn-Sham data reveals the experimental photodissociation yields as well as other structural and spectroscopic features.
      pubtype: Academic Journal
      doctype: Article
      src: R
    language: English
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          year: 2008
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