Bidirectional Solvatofluorochromism of a Pyrrolo[3,2-b]pyrrole-Diketopyrrolopyrrole Hybrid - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Journal of Physical Chemistry C Année : 2018

Bidirectional Solvatofluorochromism of a Pyrrolo[3,2-b]pyrrole-Diketopyrrolopyrrole Hybrid

Hye Gun Ryu
  • Fonction : Auteur
Maximillian F. Mayther
  • Fonction : Auteur
Jesse Tamayo
  • Fonction : Auteur
Eli M. Espinoza
  • Fonction : Auteur
Marzena Banasiewicz
  • Fonction : Auteur
Lukasz G. Lukasiewicz
  • Fonction : Auteur
Yevgen M. Poronik
  • Fonction : Auteur
Artur Jezewski
  • Fonction : Auteur
John Clark
  • Fonction : Auteur
James B. Derr
  • Fonction : Auteur
Kyo Han Ahn
  • Fonction : Auteur
Valentine I. Vullev
  • Fonction : Auteur

Résumé

Hybridization of electron donors and acceptors provides routes to long-wavelength absorbing and fluorescing dyes. Varying the coupling of low-lying charge-transfer (CT) states with the ground and different locally excited states profoundly affects the photophysics of such donor acceptor conjugates. Herein, we hybridize an electron-deficient diketopyrrolopyrrole (DPP) moiety with an electron-rich pyrrolopyrrole (PP) that is symmetrically N-arylated with 4-nitrophenyl substituents. The lowest Franck Condon state is located on the DPP ring structure and dominates the photophysics of the hybrid. Similar to the DPP moiety, the hybrid exhibits optical absorption that is invariant to the solvent media. The PP donor considerably modulates its fluorescence by undergoing electron transfer to the locally excited DPP to form a CT state. For nonpolar media, an increase in solvent polarity causes a bathochromic shift of the fluorescence reaching the longest wavelengths for chloroform and DCM. A further increase in the medium polarity moves the fluorescence maximum hypsochromically back to where it is for alkane solvents. This bidirectional solvatofluorochromism accompanies a polarity-induced increase in the nonradiative decay rates leading to a decrease in the emission quantum yield. The solvent dependence of the energy level of the CT state is responsible for the observed polarity-induced fluorescence behavior of the hybrid. This emission behavior, along with the solvent invariance of the absorption, results in multimodal sensitivity to the solvation environment.

Domaines

Chimie
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Dates et versions

hal-02140944 , version 1 (27-05-2019)

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Citer

Hye Gun Ryu, Maximillian F. Mayther, Jesse Tamayo, Cloe Azarias, Eli M. Espinoza, et al.. Bidirectional Solvatofluorochromism of a Pyrrolo[3,2-b]pyrrole-Diketopyrrolopyrrole Hybrid. Journal of Physical Chemistry C, 2018, 122 (25, SI), pp.13424-13434. ⟨10.1021/acs.jpcc.7b11194⟩. ⟨hal-02140944⟩
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