Ruthenium-terpyridine Complexes with Multiple Ethynylpyrenyl or Ethynyltoluyl Subunits: X-ray Structure, Redox and Spectroscopic Properties (Articolo in rivista)

Type
Label
  • Ruthenium-terpyridine Complexes with Multiple Ethynylpyrenyl or Ethynyltoluyl Subunits: X-ray Structure, Redox and Spectroscopic Properties (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/ic070149c (literal)
Alternative label
  • C. Goze; C. Sabatini; A. Barbieri; F. Barigelletti; R. Ziessel (2007)
    Ruthenium-terpyridine Complexes with Multiple Ethynylpyrenyl or Ethynyltoluyl Subunits: X-ray Structure, Redox and Spectroscopic Properties
    in Inorganic chemistry
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • C. Goze; C. Sabatini; A. Barbieri; F. Barigelletti; R. Ziessel (literal)
Pagina inizio
  • 7341 (literal)
Pagina fine
  • 7350 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 46 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • In: Inorganic Chemistry, vol. 46 pp. 7341 - 7350. ACS PUBLICATIONS, 2007. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 18 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1. Ist Sintesi Organ & Fotoreattivita, CNR, I-40129 Bologna, Italy 2. Univ Strasbourg 1, Ecole Chim Polymeres Mat, Lab Chim Mol, F-67087 Strasbourg 2, France (literal)
Titolo
  • Ruthenium-terpyridine Complexes with Multiple Ethynylpyrenyl or Ethynyltoluyl Subunits: X-ray Structure, Redox and Spectroscopic Properties (literal)
Abstract
  • Several heteroleptic and homoleptic ruthenium-terpyridine complexes bearing two and four ethynylpyrenyl or ethynyltoluyl residues have been prepared from complexes carrying reactive bromo functions. Cross-coupling promoted by low-valent palladium(0) on these preformed complexes has advantageously been used to prepare the target complexes. The structure of a bis-terpyridine complex carrying four ethynylpyrenyl subunits was determined by single-crystal X-ray diffraction, showing a distorted octahedral geometry around the metal center, with the ethynylpyrenyl fragment being slightly tilted (about 5) from the terpyridine plane. The molecular packing is characterized by intermolecular ··· interaction within dimers. The counteranions and the solvent molecules are entrapped in well-defined channels spanning along the a-axis. The complexes are redox active with a Ru oxidation overlapping the pyrene oxidation and two well-defined ligand-centered reduction processes. Pyrene reduction is irreversible and strongly cathodic. The new multichromophoric complexes are luminescent both in solution and in rigid matrix at 77 K, with room-temperature lifetimes and quantum yields significantly larger than those of [Ru(terpy)2]2+. At room temperature, the toluyl-substituted complexes are triplet metal-to-ligand charge-transfer (3MLCT) emitters, whereas for the pyrene-grafted complexes pyrene-centered emission is observed. For the latter complexes, the energy gap, TT, between higher 3MLCT levels and lower ligand-centered (3*, 3LC) levels is in the 640-730 cm-1 range, which results in the interstate dynamics at the basis of the observed luminescent behavior. At 77 K, for the pyrene-grafted complexes, the emission reveals features that are tentatively ascribed to intraligand interactions involving the pyrene and terpyridine units. (literal)
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