title: Deactivation of 6-aminocoumarin intramolecular charge transfer excited state through hydrogen bonding.
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.
authors.affiliation: Faculty of Chemistry, Adam Mickiewicz University in Poznań, Umultowska 89b, Poznań 61-614, Poland. ewakryst@amu.edu.pl.
authors.forename: Ewa
authors.initials: E
authors.lastname: Krystkowiak
authors.affiliation: Faculty of Physics, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań 61-614, Poland. dobas@amu.edu.pl.
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Dobek
authors.affiliation: Faculty of Chemistry, Adam Mickiewicz University in Poznań, Umultowska 89b, Poznań 61-614, Poland. iwonam@amu.edu.pl.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Maciejewski
mesh_terms: D055598:Chemical Phenomena; D004396:Coloring Agents / Q000737:chemistry*; D003374:Coumarins / Q000737:chemistry*; D006843:Hydrocarbons, Chlorinated; D006860:Hydrogen Bonding; D015394:Molecular Structure; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D004396:Coloring Agents; D003374:Coumarins; D006843:Hydrocarbons, Chlorinated; D012997:Solvents; C067496:6-amino-1,2-benzopyrone; C542783:1-chloropropane