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Issue 7, 2008
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Effect of amino substitution on the excited state dynamics of uracil

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Abstract

The excited state deactivation of two amino-substituted uracils, 5-aminouracil (5AU) and 6-aminouracil (6AU) in aqueous solution was studied by femtosecond fluorescence upconversion. The fluorescence of 6AU decays as fast as that of uracil with a unique time constant of about 100 femtoseconds. The fluorescence of 5AU exhibits a more complex behavior, fundamentally different from what we found in any other uracils: the decays are globally slower (up to several picoseconds) and depend strongly on the wavelength. This difference is attributed to the particular character of the amino group, affecting the out-of-plane motion of the 5-substituent which has been shown to be crucial for the ultrafast internal conversion occurring in uracils. Our observations indicate instead the formation of a transient fluorescent state which in turn is deactivated by a different relaxation process specific to the amino group.

Graphical abstract: Effect of amino substitution on the excited state dynamics of uracil

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Article information


Submitted
15 Jan 2008
Accepted
30 Apr 2008
First published
16 May 2008

Photochem. Photobiol. Sci., 2008,7, 765-768
Article type
Communication

Effect of amino substitution on the excited state dynamics of uracil

Á. Bányász, T. Gustavsson, E. Keszei, R. Improta and D. Markovitsi, Photochem. Photobiol. Sci., 2008, 7, 765
DOI: 10.1039/B800764K

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