Ultrafast excited-state proton transfer from hydroxycoumarin-dipicolinium cyanine dyes

Ron Simkovitch; Einat Kisin-Finfer; Shay Shomer; Rinat Gepshtein; Doron Shabat; Dan Huppert

doi:10.1016/j.jphotochem.2013.01.004

Ultrafast excited-state proton transfer from hydroxycoumarin-dipicolinium cyanine dyes

Ron Simkovitch, Einat Kisin-Finfer, Shay Shomer, Rinat Gepshtein, Doron Shabat, Dan Huppert

School of Chemistry

Tel Aviv University

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

Abstract

The photoprotolytic properties of a recently synthesized photoacid, hydroxycoumarin-dipicolinium salt (HCD) were studied by means of time-resolved emission techniques. We found that HCD is a super-photoacid with pKa*<-2 and with an excited-state proton transfer to water with a rate constant of ^kPT=1.4×10¹¹s^-1. We also found that HCD undergoes ESPT in a large number of protic solvents. The kinetic isotope effect is about two for water, methanol and ethanol.

Original language	English
Pages (from-to)	45-53
Number of pages	9
Journal	Journal of Photochemistry and Photobiology A: Chemistry
Volume	254
DOIs	https://doi.org/10.1016/j.jphotochem.2013.01.004
State	Published - 15 Feb 2013

Keywords

Excited-state proton transfer
Geminate recombination
Laser induced processes
Near infrared cyanine dye
Photoacid
Ultrafast phenomena

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering
General Physics and Astronomy

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10.1016/j.jphotochem.2013.01.004

Cite this

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title = "Ultrafast excited-state proton transfer from hydroxycoumarin-dipicolinium cyanine dyes",

abstract = "The photoprotolytic properties of a recently synthesized photoacid, hydroxycoumarin-dipicolinium salt (HCD) were studied by means of time-resolved emission techniques. We found that HCD is a super-photoacid with pKa*<-2 and with an excited-state proton transfer to water with a rate constant of kPT=1.4×1011s-1. We also found that HCD undergoes ESPT in a large number of protic solvents. The kinetic isotope effect is about two for water, methanol and ethanol.",

keywords = "Excited-state proton transfer, Geminate recombination, Laser induced processes, Near infrared cyanine dye, Photoacid, Ultrafast phenomena",

author = "Ron Simkovitch and Einat Kisin-Finfer and Shay Shomer and Rinat Gepshtein and Doron Shabat and Dan Huppert",

note = "Funding Information: This work was supported by grants from the James-Franck German-Israeli Program in Laser-Matter Interaction and by the Israel Science Foundation .",

year = "2013",

month = feb,

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doi = "10.1016/j.jphotochem.2013.01.004",

language = "الإنجليزيّة",

volume = "254",

pages = "45--53",

journal = "Journal of Photochemistry and Photobiology A: Chemistry",

issn = "1010-6030",

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TY - JOUR

T1 - Ultrafast excited-state proton transfer from hydroxycoumarin-dipicolinium cyanine dyes

AU - Simkovitch, Ron

AU - Kisin-Finfer, Einat

AU - Shomer, Shay

AU - Gepshtein, Rinat

AU - Shabat, Doron

AU - Huppert, Dan

N1 - Funding Information: This work was supported by grants from the James-Franck German-Israeli Program in Laser-Matter Interaction and by the Israel Science Foundation .

PY - 2013/2/15

Y1 - 2013/2/15

N2 - The photoprotolytic properties of a recently synthesized photoacid, hydroxycoumarin-dipicolinium salt (HCD) were studied by means of time-resolved emission techniques. We found that HCD is a super-photoacid with pKa*<-2 and with an excited-state proton transfer to water with a rate constant of kPT=1.4×1011s-1. We also found that HCD undergoes ESPT in a large number of protic solvents. The kinetic isotope effect is about two for water, methanol and ethanol.

AB - The photoprotolytic properties of a recently synthesized photoacid, hydroxycoumarin-dipicolinium salt (HCD) were studied by means of time-resolved emission techniques. We found that HCD is a super-photoacid with pKa*<-2 and with an excited-state proton transfer to water with a rate constant of kPT=1.4×1011s-1. We also found that HCD undergoes ESPT in a large number of protic solvents. The kinetic isotope effect is about two for water, methanol and ethanol.

KW - Excited-state proton transfer

KW - Geminate recombination

KW - Laser induced processes

KW - Near infrared cyanine dye

KW - Photoacid

KW - Ultrafast phenomena

UR - http://www.scopus.com/inward/record.url?scp=84873739993&partnerID=8YFLogxK

U2 - 10.1016/j.jphotochem.2013.01.004

DO - 10.1016/j.jphotochem.2013.01.004

M3 - مقالة

SN - 1010-6030

VL - 254

SP - 45

EP - 53

JO - Journal of Photochemistry and Photobiology A: Chemistry

JF - Journal of Photochemistry and Photobiology A: Chemistry

ER -

Ultrafast excited-state proton transfer from hydroxycoumarin-dipicolinium cyanine dyes

Abstract

Keywords

All Science Journal Classification (ASJC) codes

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