Excited-state proton transfer from quinone-cyanine 9 to protic polar-solvent mixtures

Ron Simkovitch, Shay Shomer, Rinat Gepshtein, Doron Shabat, Dan Huppert*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Steady-state and time-resolved emission techniques were used to study the excited-state proton-transfer (ESPT) process of quinone cyanine 9 (QCy9) in solvent mixtures. We found that the ESPT rate from QCy9 in water/methanol mixtures is independent of the mixture composition and the rate constant is kPT ∼ 1013 s-1. In ethanol/trifluoroethanol (TFE) mixtures the ESPT rate strongly depends on the solvent-mixture composition. We observe two ESPT rates rather than one over a wide range of solvent-mixture compositions. The average ESPT rate decreases as the mole fraction of TFE increases.

Original languageEnglish
Pages (from-to)1832-1840
Number of pages9
JournalJournal of Physical Chemistry A
Issue number10
StatePublished - 13 Mar 2014


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