Influence of core-substitution on the ultrafast charge separation and recombination in arylamino core-substituted naphthalene diimides

Pugliesi, Igor; Megerle, Uwe; Suraru, Sabin-Lucian; Würthner, Frank; Riedle, Eberhard und Lochbrunner, Stefan (Februar 2011): Influence of core-substitution on the ultrafast charge separation and recombination in arylamino core-substituted naphthalene diimides. In: Chemical Physics Letters, Bd. 504, Nr. 1-3: S. 24-28

Abstract

We study the charge separation and recombination of two arylamino core-substituted naphthalene diimides by transient absorption. Both compounds show a 3 ps relaxation from the initially excited partial to the full charge transfer state. Quantum chemical calculations show that this process is associated with a twisting of the arylamino substituent. In the twisted conformation the energy gap between ground and excited state is 0.7 eV for two amino core-substituents and 0.5 eV for one amino and one chloro core-substituent. The larger energy gap leads to a six-fold increase in the lifetime of the fully charge separated state from 11 to 70 ps.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0009-2614
• Sprache: Englisch