Wavelength-Dependent Electron and Energy Transfer Pathways in a side to Face Ruthenium Porphyrin/Perylene Bisimide Assembly (Articolo in rivista)

Type
Label
  • Wavelength-Dependent Electron and Energy Transfer Pathways in a side to Face Ruthenium Porphyrin/Perylene Bisimide Assembly (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/ja045379u (literal)
Alternative label
  • A. Prodi, C. Chiorboli, F. Scandola, E. Iengo, E. Alessio, R. Dobrawa, F. Wurthner (2005)
    Wavelength-Dependent Electron and Energy Transfer Pathways in a side to Face Ruthenium Porphyrin/Perylene Bisimide Assembly
    in Journal of the American Chemical Society (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • A. Prodi, C. Chiorboli, F. Scandola, E. Iengo, E. Alessio, R. Dobrawa, F. Wurthner (literal)
Pagina inizio
  • 1454 (literal)
Pagina fine
  • 1462 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 127 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 9 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 5 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento di Chimica, UniVersita` di Ferrara, 44100 Ferrara, Italy, ISOF-CNR, Sezione di Ferrara, 44100 Ferrara, Italy, INSTM, Sezione di Ferrara, 44100 Ferrara, Italy, Dipartimento di Scienze Chimiche, UniVersita` di Trieste, 34127 Trieste, Italy, and Institut fur Organische Chemie, UniVersitat Wurzburg, 97074 Wurzburg, Germany (literal)
Titolo
  • Wavelength-Dependent Electron and Energy Transfer Pathways in a side to Face Ruthenium Porphyrin/Perylene Bisimide Assembly (literal)
Abstract
  • A new side-to-face supramolecular array of chromophores, where a pyridyl-substituted perylene bisimide dye axially binds to two ruthenium porphyrin fragments, has been prepared by self-assembly. The array is formulated as DPyPBI[Ru(TPP)(CO)]2, where DPyPBI ) N,N¢-di(4-pyridyl)-1,6,7,12-tetra(4- tert-butylphenoxy)perylene-3,4:9,10-tetracarboxylic acid bisimide and TPP ) 5,10,15,20-tetraphenylporphyrin. The photophysical behavior of DPyPBI[Ru(TPP)(CO)]2 has been studied by fast (nanoseconds) and ultrafast (femtoseconds) time-resolved techniques. The observed behavior sharply changes with excitation wavelength, depending on whether the DPyPBI or Ru(TPP)(CO) units are excited. After DPyPBI excitation, the strong fluorescence typical of this unit is completely quenched, and time-resolved spectroscopy reveals the occurrence of photoinduced electron transfer from the ruthenium porphyrin to the perylene bisimide dye (ô ) 5.6 ps) followed by charge recombination (ô ) 270 ps). Upon excitation of the Ru(TPP)- (CO) fragments, on the other hand, ultrafast (ô < 1 ps) intersystem crossing is followed by triplet energy transfer from the ruthenium porphyrin to the perylene bisimide dye (ô ) 720 ps). The perylene-based triplet state decays to the ground state on a longer time scale (ô ) 9.8 ís). The photophysics of this supramolecular array provides remarkable examples of (i) wavelength-dependent behavior (a small change in excitation wavelength causes a sharp switch from electron to energy transfer) and (ii) intramolecular sensitization (the triplet state of the perylene bisimide, inaccessible in the free dye, is efficiently populated in the array). (literal)
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