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
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AN - SCOPUS:84873739993
VL - 254
SP - 45
EP - 53
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
SN - 1010-6030
ER -