title: UV-light-induced hydrogen transfer in guanosine-guanosine aggregates.
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.
authors: Institute of Physical Chemistry, Heinrich-Heine-University, 40225 Düsseldorf, Germany.
authors: Katharina
authors: K
authors: Hunger
authors: Laura
authors: L
authors: Buschhaus
authors: Lars
authors: L
authors: Biemann
authors: Michaela
authors: M
authors: Braun
authors: Sergey
authors: S
authors: Kovalenko
authors: Roberto
authors: R
authors: Improta
authors: Karl
authors: K
authors: Kleinermanns
mesh_terms: D000042:Absorption; D006151:Guanosine / Q000737:chemistry*; D006586:Hexanes / Q000737:chemistry; D006860:Hydrogen Bonding; D015394:Molecular Structure; D009705:Nucleosides / Q000737:chemistry*; D055668:Photochemical Processes; D011522:Protons; D012997:Solvents; D013057:Spectrum Analysis / Q000379:methods*; D014466:Ultraviolet Rays
chemical_list: D006586:Hexanes; D009705:Nucleosides; D011522:Protons; D012997:Solvents; D006151:Guanosine; C026385:n-hexane