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Deactivation of 6-Aminocoumarin Intramolecular Charge Transfer Excited State through Hydrogen Bonding |
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| Authors: | Ewa Krystkowiak Krzysztof Dobek Andrzej Maciejewski |
| Affiliation: | 1.Faculty of Chemistry, Adam Mickiewicz University in Poznań, Umultowska 89b, Poznań 61-614, Poland; E-Mail: ;2.Faculty of Physics, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań 61-614, Poland; E-Mail: ;3.Center for Ultrafast Spectroscopy, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań 61-614, Poland |
| Abstract: | This paper presents results of the spectral (absorption and emission) and photophysical study of 6-aminocoumarin (6AC) in various aprotic hydrogen-bond forming solvents. It was established that solvent polarity as well as hydrogen-bonding ability influence solute properties. The hydrogen-bonding interactions between S1-electronic excited solute and solvent molecules were found to facilitate the nonradiative deactivation processes. The energy-gap dependence on radiationless deactivation in aprotic solvents was found to be similar to that in protic solvents. |
| Keywords: | 6-aminocoumarin solvatochromism hydrogen bonding donor-acceptor system electronic excited state energy gap law |