Abstract

The 7-azaindole chromophore in water is studied by means of picosecond absorption and fluorescence spectroscopy in order to determine its nonradiative decay pathways. It is concluded that a small population of 7-azaindole molecules (∼20%) undergo excited-state tautomerization in about 70 ps. Intersystem crossing and photoionization are also identified as nonradiative decay channels. Photoionization occurs largely from an electronic state lying slightly in energy above the fluorescent state

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