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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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Publication details

The article was received on 15 Jan 2008, accepted on 30 Apr 2008 and first published on 16 May 2008


Article type: Communication
DOI: 10.1039/B800764K
Citation: Photochem. Photobiol. Sci., 2008,7, 765-768
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    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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