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• W2022376511 endingPage "11109" @default.
• W2022376511 startingPage "11100" @default.
• W2022376511 abstract "A complete conformational analysis on the isolated and polarizable continuum model (PCM) modeled aqueous solution cation, quinonoidal, and anion forms of pelargonidin, comprising the diverse tautomers of the latter forms, was carried out at the B3LYP/6-31++G(d,p) level. The results indicate that the most stable conformer of cationic and quinonoidal forms of pelargonidin are completely planar in the gas phase, whereas that of the anionic form is not planar. In contrast, PCM calculations show that the plane of the B ring is slightly rotated with regard to the AC bicycle in the most stable conformer of the cation and quinonoidal form. The most stable conformers of the cation, both in gas phase and aqueous solution, display anti and syn orientations for, respectively, C2−C3−O−H and C6−C5−O−H dihedral angles, whereas syn and anti orientation of hydroxyls at 7 and 4‘ positions are nearly isoenergetic. The most stable tautomer of quinonoidal pelargonidin is obtained by deprotonating hydroxyl at C5 in gas phase but at C7 according to PCM. Also, the most stable tautomer of the anion is different in gas phase (hydrogens are abstracted from hydroxyls at C5 and C4‘) and PCM simulation (C3 and C5). Tautomeric equilibria affect substantially the geometries of the AC−B backbone providing bond length variations that basically agree with the predictions of the resonance model. Most of the conformers obtained display an intramolecular hydrogen bond between O3 and H6‘. Nevertheless, this interaction is not present in the most stable anions. Ionization potentials and O−H bond dissociation energies computed for the most stable conformers of cation, quinonoidal, and anion forms are consistent with an important antioxidant activity." @default.
• W2022376511 created "2016-06-24" @default.
• W2022376511 creator A5027676095 @default.
• W2022376511 creator A5072009456 @default.
• W2022376511 date "2007-10-11" @default.
• W2022376511 modified "2023-10-18" @default.
• W2022376511 title "A Density Functional Theory Study on Pelargonidin" @default.
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• W2022376511 doi "https://doi.org/10.1021/jp074941a" @default.
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• W2022376511 hasPublicationYear "2007" @default.
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