Work Group Prof. Dr. F. Temps

XMP paper selected as Editor's Research Highlight in Focus on Chemistry

Kiel, 30 January 2017:

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We happily report that the chief editor of MDPI has selected our recent paper in Molecules, vol. 22, p. 160 (2017) by Katharina Röttger, Rebecca Stellmacher, Mayra C. Stuhldreier and Friedrich Temps on the

Ultrafast Electronic Deactivation Dynamics of Xanthosine Monophosphate

as Research Highlight in the January 30 edition of Focus on Chemistry.

Abstract: Ultrafast energy dissipation is a crucial factor for the photostability of DNA and RNA, but even some of the key electronic deactivation pathways in monomeric nucleic acid building stones are still controversial. Here, we report on the excited-state dynamics of the rare nucleotide xanthosine monophosphate as a function of deprotonation state (XMP vs. XMP ) and excitation wavelength ( λpump =  278–243 nm) by femtosecond time-resolved fluorescence and absorption spectroscopy. We show that the predominating relaxation channel leads to a return of the photo-excited molecules to the electronic ground state in τ ∼ 1 ps. The mechanism likely involves an out-of-plane deformation of the five-membered ring, different from the main electronic deactivation pathways in the canonical purine bases adenine and guanine. The results are discussed in terms of the structural and electronic differences of XMP compared to the canonical nucleotides.

To read the full article see: DOI 10.3390/molecules22010160