UV‐Light‐Induced Hydrogen Transfer in Guanosine–Guanosine Aggregates |
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| Authors: | Katharina Hunger Laura Buschhaus Dr Lars Biemann Michaela Braun Dr Sergey Kovalenko Dr Roberto Improta Prof Karl Kleinermanns |
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| Institution: | 1. Institute of Physical Chemistry, Heinrich‐Heine‐University, 40225 Düsseldorf (Germany);2. Department of Chemistry, Humboldt University, 12489 Berlin (Germany);3. Istituto Biostrutture e Bioimmagini‐CNR, 80134 Napoli (Italy) |
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| Abstract: | Aggregates of a lipophilic guanine (G) derivative have been studied in n‐hexane by femtosecond‐to‐microsecond UV‐visible broadband transient absorption, stationary infrared and UV‐visible spectroscopy and by quantum chemical calculations. We report the first time‐resolved spectroscopic detection of hydrogen transfer in GG aggregates, which leads to (G?H) . radicals by means of G+G? charge transfer followed by proton transfer. These radicals show a characteristic electronic spectrum in the range 300–550 nm. The calculated superimposed spectrum of the species that result from NH???N proton transfer agrees best with the experimental spectrum. |
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| Keywords: | aggregation hydrogen transfer nucleosides photochemistry radicals |
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