Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 116, Issue 27, Pages 7353-7363Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp304123y
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Funding
- James-Franck German-Israeli Program in Laser-Matter Interaction
- Israel Science Foundation
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Steady-state and time-resolved emission techniques were used to study the photoprotolytic properties of three recently synthesized strong quinone cyanine photoacids (QCy7 and its sulfonated derivatives). The rate coefficient of the excited-state proton transfer (ESPT), km, of the three dyes is roughly 1.5 X 10(12) s(-1), a high value that is comparable to the solvation dynamics rate of large polar organic molecules in H2O and D2O. It is twice as fast as the proton transfer rate between two adjacent water molecules in liquid water. We found that, as expected, two of the sulfonated photoacids geminately recombines with the proton at an elevated rate. The accelerated geminate recombination process of the sulfonated derivatives is different from a simple diffusion process of protons. The ESPT rate coefficient of these molecules is the highest recorded thus far.
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