Kinetics of ultra-fast excited state proton transfer from 7-hydroxy-4-methylflavylium chloride to water

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Abstract

Excited state proton transfer from 7-hydroxy-4-methylflavylium chloride to water is reported. From a modified analysis of picosecond time-resolved fluorescence data (not using the lifetime of a parent compound), all rate constants were determined: the deprotonation rate constant of the flavylium cation, kd=1.4×1011 s-1, the protonation rate constant of the base form, kp=2.3×1010 l mol-1 s-1 and the reciprocal fluorescence lifetimes of these species, kAH +=7.8×109 s-1AH +=128 ps) and kA=7.6×109 s-1A=132 ps), in water, at 20°C. The value of kd is the largest measured value for an intermolecular proton transfer (to water).

Original languageEnglish
Pages (from-to)189-195
Number of pages7
JournalChemical Physics Letters
Volume298
Issue number1-3
DOIs
Publication statusPublished - 11 Dec 1998

Keywords

  • Anthocyanins
  • Flowers
  • Flavylium cation

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