Eilatin complexes of Ruthenium and Osmium. Synthesis, electrochemical behavior, and near-IR luminescence (Articolo in rivista)

Type
Label
  • Eilatin complexes of Ruthenium and Osmium. Synthesis, electrochemical behavior, and near-IR luminescence (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/ic051022v (literal)
Alternative label
  • S. D. Bergman; D. Gut; M. Kol; C. Sabatini; A. Barbieri; F. Barigelletti (2005)
    Eilatin complexes of Ruthenium and Osmium. Synthesis, electrochemical behavior, and near-IR luminescence
    in Inorganic chemistry
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • S. D. Bergman; D. Gut; M. Kol; C. Sabatini; A. Barbieri; F. Barigelletti (literal)
Pagina inizio
  • 7943 (literal)
Pagina fine
  • 7950 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 44 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 22 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1. Tel Aviv Univ, Sch Chem, Raymond & Beverly Sackler Fac Exact Sci, IL-69978 Tel Aviv, Israel 2. CNR, ISOF, I-40129 Bologna, Italy (literal)
Titolo
  • Eilatin complexes of Ruthenium and Osmium. Synthesis, electrochemical behavior, and near-IR luminescence (literal)
Abstract
  • The synthesis and characterization of new Ru(II) and Os(II) complexes of the ligand eilatin (1) are described. The new complexes [Ru(bpy)(eil)(2)](2+) (2), [Ru(eil)(3)](2+) (3), and [Os(eil)(3)](2+) (4) (bpy = 2,2'-bipyridine; eil = eilatin) were synthesized and characterized by NMR, fast atom bombardment mass spectrometry, and elemental analysis, In the series of complexes [Ru(bpy)(x)(eil)(y)](2+) (x + y = 3), the effect of sequential substitution of eil for bpy on the electrochemical and photophysical properties was examined. The absorption spectra of the complexes exhibit several bpy- and eil-associated pi-pi* and metal-to-ligand charge-transfer (MLCT) transitions in the visible region (400-600 nm), whose energy and relative intensity depend on the number of ligands bound to the metal center (x and y). On going from [Ru(bpy)(2)(eil)](2+) (5) to 2 to 3, the d(pi)(Ru) -> pi*(eil) MLCT transition undergoes a red shift from 583 to 591 to 599 nm, respectively. Electrochemical measurements performed in dimethyl sulfoxide reveal several ligand-based reduction processes, where each eil ligand can accept up to two electrons at potentials that are significantly anodically shifted (by ca. 1 V) with respect to the bpy ligands. The complexes exhibit near-IR emission (900-1100 nm) of typical (MLCT)-M-3 character, both at room temperature and at 77 K. Along the series 5, 2, and 3, upon substitution of eil for bpy, the emission maxima undergo a blue shift and the quantum yields and lifetimes increase. The radiative and nonradiative processes that contribute to deactivation of the excited level are discussed in detail. (literal)
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