Photoinduced Electron Transfer in Bis-Porphyrin Di-imide Complexes (Articolo in rivista)

Type
Label
  • Photoinduced Electron Transfer in Bis-Porphyrin Di-imide Complexes (Articolo in rivista) (literal)
Anno
  • 2002-01-01T00:00:00+01:00 (literal)
Alternative label
  • Flamigni L., Johnston M. R., Giribabu L. (2002)
    Photoinduced Electron Transfer in Bis-Porphyrin Di-imide Complexes
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Flamigni L., Johnston M. R., Giribabu L. (literal)
Pagina inizio
  • 3938 (literal)
Pagina fine
  • 3947 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 8 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Vengono presentati dei sistemi autoassemblanti in soluzione, caratterizzati da elevata stabilita' ed in grado di produrre stati a cariche separate in seguito ad assorbimento di luce. (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto ISOF-CNR e University of Central Queensland, Centre for Molecular Architecture, Rockhampton, Australia (literal)
Titolo
  • Photoinduced Electron Transfer in Bis-Porphyrin Di-imide Complexes (literal)
Abstract
  • The bisporphyrin host ZnH was synthesized, and its complexation with two aromatic diimide guest molecules, bis(pyridyl)naphthalenediimide NIN and bis(pyridyl)phenyldiimide PIN, was investigated by H-1 NMR and UV/Vis spectroscopy. The diimide guests were complexed simultaneously with both metalloporphyrins of the host, with association constants on the order of 10(8) M-1. The processes occurring in the complex after excitation of the porphyrinic host were studied by steady-state and time-resolved emission and transient absorption spectroscopy. Complexation alters the photophysical properties of the host ZnH; the luminescence bands shift to the red by 30 nm in the complexed forms, while the emission quantum yield and the lifetime decrease. Comparison of a complex between ZnH and a model guest unable to undergo photoinduced processes allowed us to establish that, in the diimide complexes, quenching of the porphyrinic luminescence occurs with a rate of 1.1x10(10) s(-1). The process is identified as an electron transfer from the excited singlet of the porphyrinic host to the imide guest, which yields charge-separated states with a lifetime of 710 ps for ZnH+-NIN- and 260 ps for ZnH+-PIN-. (literal)
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