Change of the tautomeric preference for radical cation of pyruvic acid. DFT studies in the gas phase
الموضوعات : Journal of the Iranian Chemical Research
Ewa Daniela Raczyńska
1
(Department of Chemistry, Warsaw University of Life Sciences, 02-776 Warszawa, Poland)
Malgorzta Hallmann
2
(Department of Chemistry, Warsaw University of Life Sciences, 02-776 Warszawa, Poland)
Kinga Duczmal
3
(Department of Chemistry, Warsaw University of Life Sciences, 02-776 Warszawa, Poland)
الکلمات المفتاحية: DFT, Pyruvic acid, Keto-enol tautomerism, Ionization effect,
ملخص المقالة :
Keto-enol tautomerism was investigated for ionized pyruvic acid using the DFT(B3LYP) method and the larger basis sets [6-31++G(d,p), 6-311++G(3df, 3pd) and aug-cc-pVDZ]. Change of the tautomeric preference was observed when going from the neutral to ionized tautomeric mixture. Ionization favors the enolization process (ketoenol) of pyruvic acid, whereas the ketonization (ketoenol) is preferred for the neutral system. Ionization influences also -electron delocalization, which increases exceptionally in the enol form, and slightly decreases in the keto form.
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