Comparison of the Photoprotolytic Processes of Three 7-Hydroxycoumarins

Ron Simkovitch, Luís Pinto da Silva, Joaquim C.G. Esteves da Silva, Dan Huppert*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

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 × 1010 s-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.

Original languageEnglish
Pages (from-to)10297-10310
Number of pages14
JournalJournal of Physical Chemistry B
Volume120
Issue number39
DOIs
StatePublished - 6 Oct 2016

Funding

FundersFunder number
COMPETE-POFCPTC/QEQQFI/ 0289/2014
Fundação para a Ciência e a Tecnologia
Ministerio de Economía y Competitividad
Israel Science Foundation
European Regional Development Fund

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