Details

Autor(en) / Beteiligte

• Fennel, Franziska
• Wolter, Steffen
• Xie, Zengqi
• Plötz, Per-Arno
• Kühn, Oliver
• Würthner, Frank
• Lochbrunner, Stefan

Titel

Biphasic Self-Assembly Pathways and Size-Dependent Photophysical Properties of Perylene Bisimide Dye Aggregates

Ist Teil von

• Journal of the American Chemical Society, 2013-12, Vol.135 (50), p.18722-18725

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2013

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The concentration-dependent absorption and temperature-dependent fluorescence of the perylene bisimide dye PBI 1 in methyl­cyclohexane point to a biphasic aggregation behavior. At intermediate concentrations and temperatures, respectively, a dimer with low fluorescence yield dominates, which cannot be extended to longer aggregates. Those are formed at high concentrations and low temperatures, respectively, via a second, energetically unfavorable dimer species that acts as a nucleus. A corresponding aggregation model reproduces accurately the concentration dependence and allows extracting the equilibrium constants and spectra of the distinct species. The differences in the photo­physical properties indicate H-type excitonic coupling for the favored dimer and J-type characteristics for the extended aggregates which could be related to structural models based on DFT calculations. The energetics can be understood by considering hydrogen-bonding and π–π-stacking interactions.