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Title:Intramolecular Hydrogen Bonding Motifs In Deprotonated Glycine Peptides Revealed By Cryogenic Ion Vibrational Spectroscopy
Author(s):Duffy, Erin M.
Contributor(s):Garand, Etienne; Zhou, Jia; Soukup, Michael; Marsh, Brett
Subject(s):Mini-symposium: Beyond the Mass-to-Charge Ratio: Spectroscopic Probes of the Structures of Ions
Abstract:We present the infrared spectra of deprotonated glycine chains, (\chem{Gly_n-H})$^{-}$, where n=1-4, obtained by cryogenic ion vibrational spectroscopy. Comparisons between the experimental and calculated spectra reveal the dependence on chain length of the hydrogen bonding motifs within these species. First, an interaction between the terminal carboxylate and the neighboring amide \chem{N-H} is present in all the peptide structures. In the longer (\chem{Gly_3-H})$^{-}$ and (\chem{Gly_4-H})$^{-}$ structures, the peptide chain folds such that the terminal \chem{NH_2} group also interacts with the carboxylate. Both of these also display an interaction between the terminal \chem{NH_2} and the neighboring amide \chem{N-H}. Finally, (\chem{Gly_4-H})$^{-}$ is the first among these species to contain an amide-amide interaction. Analysis of the \chem{N-H} peak positions elucidates the interplay among these different hydrogen bonds, especially around the negatively charged carboxylate moiety.
Issue Date:2014-06-17
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:Duffy, E.M.; Garand, E.; Zhou, J.; Soukup, M.; Marsh, B. INTRAMOLECULAR HYDROGEN BONDING MOTIFS IN DEPROTONATED GLYCINE PEPTIDES REVEALED BY CRYOGENIC ION VIBRATIONAL SPECTROSCOPY. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.TG12
Genre:Conference Paper / Presentation
Rights Information:Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License.
Date Available in IDEALS:2014-09-17

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