Hydrogen bond mediated stabilization of the salt bridge structure for the glycine dimer anion

Literature Information

Publication Date 2015-10-27
DOI 10.1039/C5CP06120B
Impact Factor 3.676
Authors

S. Heiles, Richard J. Cooper, Giel Berden, Evan R. Williams


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Abstract

The formation of a salt bridge in deprotonated glycine dimer anions in a solvent-free environment is investigated using both infrared multiple photon dissociation spectroscopy between 600 and 1800 cm−1 and theory. The zwitterionic and nonzwitterionic forms of glycine in this complex are computed to be nearly iso-energetic, yet predominantly the zwitterionic form is observed experimentally. The zwitterion stability is attributed to both the Coulombic attraction and the high stabilization from intramolecular hydrogen bonding that drives the energetic cost of proton transfer in a solvent free environment. These results show that there is a fine balance between the stabilities of these two forms of the anion. Elucidating the role of intrinsic factors, such as hydrogen bonding, can lead to a better understanding of the stabilities of salt bridges in the interiors of large proteins or at protein interfaces.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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