Kinetic isotope effect on the proton-transfer in indigo carmine

Izumi Iwakura, Atsushi Yabushita, Takayoshi Kobayashi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


We have found that photo-excited indigo carmine causes stepwise proton transfer to generate mono-alcohol intermediate, which immediately returns to the parent molecule [I. Iwakura, A. Yabushita, T. Kobayashi, Chem. Lett. 38 (2009) 1020]. The kinetic isotope effect in the proton transfer of this system has been studied by direct observation of the real-time molecular vibrational amplitude during the reaction including the transition state using a sub-5-fs laser pulse. The kaH / kaD ratio for the proton transfer after photo-excitation is observed to be 1.5 ± 0.1.

Original languageEnglish
Pages (from-to)354-357
Number of pages4
JournalChemical Physics Letters
Issue number4-6
StatePublished - 7 Jan 2010


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