title: An intermolecular hydrogen-bonding effect on spectral and photophysical properties of 6-aminocoumarin in protic solvents.
abstract: The paper presents results of the spectral (absorption and emission) and photophysical study of 6-aminocoumarin (6AC) in strong protic solvents with different hydrogen-bond acidity. The measurements of the fluorescence lifetime and quantum yield clearly show that in protic solvents intermolecular hydrogen-bonding interactions between solute and solvent molecules facilitate the nonradiative processes. It is suggested that in these solvents very efficient internal conversion due to intermolecular hydrogen-bonding is induced. A large isotope effect is found for 6AC in deuterated water.
authors.affiliation: Department of Chemistry, Adam Mickiewicz University, Umultowska 89B, 61-614 Poznań, Poland. ewakryst@amu.edu.pl
authors.forename: Ewa
authors.initials: E
authors.lastname: Krystkowiak
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Dobek
authors.forename: Andrzej
authors.initials: A
authors.lastname: Maciejewski