Röttger, Katharina, Stellmacher, Rebecca, Stuhldreier, Mayra and Temps, Friedrich (2017) Ultrafast Electronic Deactivation Dynamics of Xanthosine Monophosphate. Molecules, 22 (1). p. 160. DOI 10.3390/molecules22010160.

Full text not available from this repository.

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 (
λ
pump
=
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.

Document Type:	Article
Keywords:	biophysics; DNA; RNA; ultrafast photochemistry; xanthosine monophosphate; XMP; transient absorption; fluorescence up-conversion
Research affiliation:	Kiel University > Kiel Marine Science OceanRep > The Future Ocean - Cluster of Excellence Kiel University
Refereed:	Yes
Open Access Journal?:	Yes
Publisher:	MDPI
Date Deposited:	21 Dec 2017 12:53
Last Modified:	13 May 2019 09:57
URI:	https://oceanrep.geomar.de/id/eprint/41102

Actions (login required)

View Item