Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 120, Issue 39, Pages 10297-10310Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.6b01383
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Funding
- Israel Science Foundation
- FCT/MEC (PIDDAC)
- Fundo Europeu de Desenvolvimento Regional (FEDER) through COMPETE-POFC [PTC/QEQ-QFI/0289/2014]
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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 X 10(10) 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.
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