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Hydrogen bonding effects on acidity enhancement of barbiturates and their metabolites in gas and solution phase, a DFT study

Daneshfar, M ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.comptc.2020.113112
  3. Publisher: Elsevier B.V , 2021
  4. Abstract:
  5. Density functional theory method and B3LYP/6-31+G(d) level of theory were used to predict the acidity of barbiturates and their corresponding metabolites in the gas and solution phase (H2O). Polarized continuum model was applied to calculate pKa values of barbiturates and metabolites. A comparison between acidity of barbiturates and metabolites in the gas and solution phase indicates that the acidity strength of barbiturates enhances with the increase of intramolecular hydrogen bonds in metabolites. This acidity can increase to 9.47 kcal/mol in gas phase and 2.73 pKa units in solution phase for a typical metabolite of barbiturate due to the effect of intramolecular hydrogen bonds. Also, linear correlation between gas phase acidity (ΔGacid) and solution phase (pKa) was obtained and can be used for pKa prediction of metabolites in solution phase. © 2020
  6. Keywords:
  7. Acidity ; Barbiturates ; DFT method ; Hydrogen bonding ; Metabolite ; PKa
  8. Source: Computational and Theoretical Chemistry ; Volume 1196 , 2021 ; 2210271X (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S2210271X20304126