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Zundel-type H-bonding in biomolecular ions. | LitMetric
Using quantum chemical calculations and infrared multiphoton dissociation (IRMPD) spectroscopy in the fingerprint and X-H stretching regions, we demonstrate here that the all-Ala (b6) fragment ion features a macrocyclic structure with C(2) symmetry. For this structure, the ionizing proton is equally shared by the Ala(1) and Ala(4) amide oxygens in a Zundel-type symmetric (X…H(+)…X) H-bond.
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Université Paris Sud , UMR8000 CNRS, Faculté des Sciences, Bât. 350, 91405, Orsay Cedex, France.
Using quantum chemical calculations and infrared multiphoton dissociation (IRMPD) spectroscopy in the fingerprint and X-H stretching regions, we demonstrate here that the all-Ala (b6) fragment ion features a macrocyclic structure with C(2) symmetry. For this structure, the ionizing proton is equally shared by the Ala(1) and Ala(4) amide oxygens in a Zundel-type symmetric (X…H(+)…X) H-bond.
Infrared, Raman and INS spectra of picolinic acid N-oxide (PANO) were recorded and examined for the location of the hydronic modes, particularly O-H stretching and COH bending. PANO is representative of strong chelate hydrogen bonds (H-bonds) with its short O..
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