TY - JOUR
T1 - Comparison of the Photoprotolytic Processes of Three 7-Hydroxycoumarins
AU - Simkovitch, Ron
AU - Pinto da Silva, Luís
AU - Esteves da Silva, Joaquim C.G.
AU - Huppert, Dan
N1 - Publisher Copyright:
© 2016 American Chemical Society.
PY - 2016/10/6
Y1 - 2016/10/6
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84990242769&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcb.6b01383
DO - 10.1021/acs.jpcb.6b01383
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AN - SCOPUS:84990242769
SN - 1520-6106
VL - 120
SP - 10297
EP - 10310
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 39
ER -