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UV‐Light‐Induced Hydrogen Transfer in Guanosine–Guanosine Aggregates
Author(s) -
Hunger Katharina,
Buschhaus Laura,
Biemann Lars,
Braun Michaela,
Kovalenko Sergey,
Improta Roberto,
Kleinermanns Karl
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201204286
Subject(s) - photochemistry , microsecond , chemistry , radical , ultrafast laser spectroscopy , proton , guanosine , visible spectrum , spectroscopy , guanine , absorption spectroscopy , absorption (acoustics) , hydrogen , femtosecond , analytical chemistry (journal) , materials science , optics , organic chemistry , optoelectronics , laser , nucleotide , biochemistry , physics , quantum mechanics , composite material , gene
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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