An extensive spectroscopic analysis is presented of an elongated polycondensed dye with a donor–acceptor substitution. The charge-transfer (CT) state, polarized along the long molecular axis, is close in energy to a local excitation (LE) of the polycondensed system, roughly polarized along the short molecular axis, which makes this system particularly suitable to investigate the subtle LE/CT interplay. An essential-state model is presented that quantitatively reproduces absorption and fluorescence spectra, as well as fluorescence emission and excitation anisotropy spectra collected in solvents of different polarity and viscosity, which sets a sound basis for the understanding of how solvent polarity and solvent relaxation affect the nature of low-lying excitations. The markedly different fluorescence emission and excitation anisotropy spectra measured in glassy and liquid polar solvents unambiguously demonstrate the major role played by solvent relaxation in the definition of fluorescence properties of the dye.

Tuning the Nature of the Fluorescent State: A Substituted Polycondensed Dye as a Case Study / Sissa, Cristina; V., Calabrese; M., Cavazzini; Grisanti, Luca; Terenziani, Francesca; S., Quici; Painelli, Anna. - In: CHEMISTRY-A EUROPEAN JOURNAL. - ISSN 0947-6539. - 19:3(2013), pp. 924-935. [10.1002/chem.201202154]

Tuning the Nature of the Fluorescent State: A Substituted Polycondensed Dye as a Case Study

SISSA, Cristina;GRISANTI, Luca;TERENZIANI, Francesca;PAINELLI, Anna
2013-01-01

Abstract

An extensive spectroscopic analysis is presented of an elongated polycondensed dye with a donor–acceptor substitution. The charge-transfer (CT) state, polarized along the long molecular axis, is close in energy to a local excitation (LE) of the polycondensed system, roughly polarized along the short molecular axis, which makes this system particularly suitable to investigate the subtle LE/CT interplay. An essential-state model is presented that quantitatively reproduces absorption and fluorescence spectra, as well as fluorescence emission and excitation anisotropy spectra collected in solvents of different polarity and viscosity, which sets a sound basis for the understanding of how solvent polarity and solvent relaxation affect the nature of low-lying excitations. The markedly different fluorescence emission and excitation anisotropy spectra measured in glassy and liquid polar solvents unambiguously demonstrate the major role played by solvent relaxation in the definition of fluorescence properties of the dye.
2013
Tuning the Nature of the Fluorescent State: A Substituted Polycondensed Dye as a Case Study / Sissa, Cristina; V., Calabrese; M., Cavazzini; Grisanti, Luca; Terenziani, Francesca; S., Quici; Painelli, Anna. - In: CHEMISTRY-A EUROPEAN JOURNAL. - ISSN 0947-6539. - 19:3(2013), pp. 924-935. [10.1002/chem.201202154]
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2550644
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 18
  • ???jsp.display-item.citation.isi??? 19
social impact