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Gallic acid: thermodynamics of the homolytic and heterolytic phenolic O—H bonds splitting-off Cover

Gallic acid: thermodynamics of the homolytic and heterolytic phenolic O—H bonds splitting-off

Open Access
|Dec 2016

Abstract

The DFT study of primary antioxidant action of gallic acid and its carboxylic anion is presented in the gas-phase, benzene and water. Corresponding reaction enthalpies for three possible mechanisms was calculated using B3LYP/6-311++G** method. Bond dissociation enthalpy (BDE) and proton dissociation enthalpy (PDE) of 4-OH group was found to be the lowest in gas-phase as well as in both solvents approximated by IEF-PCM model. Ionization potentials (IPs) were higher than BDEs in all cases. Deprotonation of carboxylic group result in increased antioxidant potency as drop in BDE, proton affinities (PAs) and IPs was indicated in all environments.

DOI: https://doi.org/10.1515/acs-2016-0020 | Journal eISSN: 1339-3065 | Journal ISSN: 1337-978X
Language: English
Page range: 114 - 123
Published on: Dec 8, 2016
Published by: Slovak University of Technology in Bratislava
In partnership with: Paradigm Publishing Services
Publication frequency: 2 issues per year
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© 2016 Peter Škorňa, Martin Michalík, Erik Klein, published by Slovak University of Technology in Bratislava
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.