Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 125, Issue 1, Pages 198-208Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.0c09116
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Funding
- Brazilian agency CNPq [306433/2019-2, 204748/2018-6]
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This study investigated the O-H bond dissociation enthalpies (BDEs) and ionization potential (IP) of gallic acid (GA) using different computational methods, with M06-2X identified as the most suitable DFT functional for studying its antioxidant potential.
We present a benchmark investigation on the O-H bond dissociation enthalpies (BDEs) and ionization potential (IP) for gallic acid (GA), a widely known polyphenolic antioxidant. These properties were determined in the gas-phase and in water through the use of density functional theory (DFT), second-order Meller-Plesset perturbation theory (MP2), coupled-cluster with single and double excitations (CCSD), and coupled-cluster with single and double excitations as well as perturbative inclusion of triples (CCSD(T)). The 6-311++G(df,p), cc-pVDZ, aug-cc-pVDZ, cc-pVTZ, and aug-cc-pVTZ basis sets were used. Regarding DFT functionals, the M06-2X provided the best agreement for the BDEs when compared to the corresponding CCSD(T)/aug-cc-pVTZ results; M06-2X was also found to be the most suitable for probing the IP for the protonated forms of GA while LC-omega PBE was the most reliable in the case of deprotonated GA. Given that these properties represent important descriptors for examining mechanisms related to the antioxidant potential of a given polyphenol, we hope that the present work can serve as a guide for computational chemists venturing in the field.
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