title: Comparison of the Photoprotolytic Processes of Three 7-Hydroxycoumarins.
abstract: Steady-state and time-resolved fluorescence techniques, in addition to quantum mechanical calculations, were employed to study the excited-state proton transfer (ESPT) to solvent of three 7-hydroxycoumarin dyes. We found that for 7-hydroxycoumarins in water, the ESPT rate is high, about 2 × 1010s-1, whereas in methanol the ESPT rate is much lower than that over the nonradiative lifetime of the excited singlet state; thus, the ESPT efficiency is very low.
authors: Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University , Tel Aviv 69978, Israel.
authors: Ron
authors: R
authors: Simkovitch
authors: Luís
authors: L
authors: Pinto da Silva
authors: Joaquim C G
authors: JC
authors: Esteves da Silva
authors: Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University , Tel Aviv 69978, Israel.
authors: Dan
authors: D
authors: Huppert