Nonradiative relaxation in thiophene-S,S-dioxide derivatives: the role of the environment (Articolo in rivista)

Type
Label
  • Nonradiative relaxation in thiophene-S,S-dioxide derivatives: the role of the environment (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/jp046465j (literal)
Alternative label
  • M. Anni ; M. F. Raganato ; F. Della Sala ; E. Fabiano ; R. Cingolani ; G. Gigli ; G. Barbarella ; L. Favaretto ; A. Görling (2005)
    Nonradiative relaxation in thiophene-S,S-dioxide derivatives: the role of the environment
    in The journal of physical chemistry. B
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • M. Anni ; M. F. Raganato ; F. Della Sala ; E. Fabiano ; R. Cingolani ; G. Gigli ; G. Barbarella ; L. Favaretto ; A. Görling (literal)
Pagina inizio
  • 6004 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://pubs.acs.org/doi/abs/10.1021/jp046465j (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 109 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • National Nanotechnology Laboratory (NNL) of INFM, Dipartimento di Ingegneria dell'Innovazione, Università degli Studi di Lecce, Via per Arnesano, 73100 Lecce, Italy ISOF, Area della ricerca CNR, Via Gobetti 101, I-40129 Bologna, Italy Institut für Physikalische und Theoretische Chemie, Wegelerstr. 12, D-55317 Bonn, Germany (literal)
Titolo
  • Nonradiative relaxation in thiophene-S,S-dioxide derivatives: the role of the environment (literal)
Abstract
  • The intramolecular radiative and nonradiative relaxation processes of three thiophene-S,S-dioxide derivatives with different molecular rigidity are investigated in different solutions and in inert matrix. We show that the fluorescence quantum efficiency and the relaxation dynamics are strongly dependent on the environment viscosity, whereas they are almost independent of the environment polarity. We demonstrate that this strong dependence is due to an environment dependent nonradiative decay rate, whereas no relevant variations of the radiative decay rate are observed. We demonstrate that the dipole coupling with the solvent does not provide an efficient nonradiative decay channel and that the Sn - S1 vibrational relaxation is very efficient in all of the molecules and for all of the investigated environments. Moreover first-principles time-dependent density-functional theory calculations in the correct, i.e., excited-state, molecular conformation, suggest that significant contributions of intersystem crossing to the triplet manifold can be excluded. We then conclude that the main nonradiative process determining the fluorescence quantum efficiency of this class of molecules is S1 - S0 internal conversion (IC). An explanation for the IC rate dependence in terms of the environment viscosity, molecular rigidity, S1 - S0 energy-gap, and molecular volume is presented. (literal)
Autore CNR
Insieme di parole chiave

Incoming links:


Autore CNR di
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi
Insieme di parole chiave di
data.CNR.it