期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 114, 期 35, 页码 9471-9479出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp1059837
关键词
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资金
- Israel Science Foundation
- James-Franck German-Israeli Program in Laser-Matter Interaction
Steady-state emission and time-resolved techniques were employed to study the photoprotolytic processes D-luciferin undergoes in water-methanol mixtures over a wide range of molar fractions (chi(meOH)) of methanol. We found that in the concentration range of 0 < chi(MeOH) < 0.8 the rate constant of the excited-state proton transfer (ESPT) to the solvent decreases nearly exponentially with increasing chi(MeOH). At chi(MeOH) > 0.8 the proton transfer rate constant decreases with an even steeper slope. The kinetic isotope effect (KIE) maintains a constant value of 2.4 +/- 0.2 at all the mixture's compositions.
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