@article{28467141936648519dcf8174fd049ec3,
title = "Comparison of the rate of excited-state proton transfer from photoacids to alcohols and water",
abstract = "Steady-state and time-resolved techniques were employed to study the excited-state proton-transfer (ESPT) rate of two newly synthesized photoacids - quinone cyanine diindolium (QCy7) and its dipicolinium analog (QCy9) - in three protic solvents, water, methanol and ethanol. The ESPT rate constant k PT of QCy7, whose pKa*∼-6.5 in water, methanol and ethanol is 1.2 × 1013 s-1, 8 × 1011 s -1, 7 × 1011 s-1 respectively. k PT for QCy9 (pKa*∼-8.5), is 1013 s-1 for all three protic solvents used. We qualitatively explain these results and also the previously found solvent dependence of kPT of weaker photoacids by adiabatic and non-adiabatic proton-transfer formalism.",
keywords = "Fast reactions, Photoacids, Protic solvents, Proton transfer, Quinone cyanine",
author = "Ron Simkovitch and Shay Shomer and Rinat Gepshtein and Roth, {Michal E.} and Doron Shabat and Dan Huppert",
note = "Funding Information: We thank professor A. Nitzan for helpful discussions. This work was supported by grants from the James-Franck German-Israeli Program in Laser-Matter Interaction and by the Israel Science Foundation . ",
year = "2014",
month = mar,
day = "1",
doi = "10.1016/j.jphotochem.2013.12.009",
language = "אנגלית",
volume = "277",
pages = "90--101",
journal = "Journal of Photochemistry and Photobiology A: Chemistry",
issn = "1010-6030",
publisher = "Elsevier B.V.",
}