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Energy-Dependent UV Photodissociation of Gas-Phase Adenosine Monophosphate Nucleotide Ions: The Role of a Single Solvent Molecule

Abstract : The photodissociation of gaseous protonated adenosine 5'-monophosphate (AMP) and the same system hydrated with one water molecule has been investigated in the 4 to 13 eV photon energy range by coupling a linear quadrupole ion trap with a synchrotron radiation beamline. The dissociation of the bare AMP cation upon absorption of a single ultraviolet (UV) photon below the ionization energy (IE) almost exclusively produces the protonated adenine base, with a measured photodissociation yield showing spectroscopic features with dominant absorption bands located at 4.75 and 6.5 eV, found in agreement with TD-DFT calculations. Nevertheless, the addition of a single water molecule to the system modifies the dissociation energy dependence and strongly suppresses the cleavage of the glycosidic CN bond below the IE. Both the experimental and theoretical results suggest that a single solvent molecule can intrinsically influence the structure and physicochemical properties of the AMP cation, including its UV induced dissociation pattern, beyond the simple water evaporation.
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https://hal.inrae.fr/hal-02638052
Contributor : Migration Prodinra <>
Submitted on : Thursday, May 28, 2020 - 9:08:13 AM
Last modification on : Thursday, August 13, 2020 - 2:12:03 PM

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Aleksandar R. Milosavljevic, Viktor Z. Cerovski, Francis Canon, Milosg Lj. Rankovic, Nikola Skoro, et al.. Energy-Dependent UV Photodissociation of Gas-Phase Adenosine Monophosphate Nucleotide Ions: The Role of a Single Solvent Molecule. Journal of Physical Chemistry Letters, American Chemical Society, 2014, 5 (11), pp.1994 - 1999. ⟨10.1021/jz500696b⟩. ⟨hal-02638052⟩

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