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

Ron Simkovitch; Shay Shomer; Rinat Gepshtein; Doron Shabat; Dan Huppert

doi:10.1021/jp412428a

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

School of Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

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 k_PT ∼ 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 language	English
Pages (from-to)	1832-1840
Number of pages	9
Journal	Journal of Physical Chemistry A
Volume	118
Issue number	10
DOIs	https://doi.org/10.1021/jp412428a
State	Published - 13 Mar 2014

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abstract = "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.",

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AU - Simkovitch, Ron

AU - Shomer, Shay

AU - Gepshtein, Rinat

AU - Shabat, Doron

AU - Huppert, Dan

PY - 2014/3/13

Y1 - 2014/3/13

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AB - 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.

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

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