Title: Why is Indigo Photostable over Extremely Long Periods?
Authors: Iwakura, Izumi
Yabushita, Atushi
Kobayashi, Takayoshi
Department of Electrophysics
Issue Date: 5-Nov-2009
Abstract: This experimental work clarifies the mechanism for the Ultra-photostability of indigo carmine by direct observation of a transition state using a sub 5-fs laser pulse. The molecular structural changes during the photoexcited proton-transfer process were traced as the time-dependent instantaneous frequency of molecular vibrations. The mono-alcohol intermediate generated by proton transfer via stepwise path was found to be unstable, and it immediately reverted to indigo carmine. This regression to the reactant is the reason for the ultraphotostability of indigo over extremely long periods.
URI: http://dx.doi.org/10.1246/cl.2009.1020
ISSN: 0366-7022
DOI: 10.1246/cl.2009.1020
Volume: 38
Issue: 11
Begin Page: 1020
End Page: 1021
Appears in Collections:Articles

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