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• W2020368212 endingPage "6275" @default.
• W2020368212 startingPage "6269" @default.
• W2020368212 abstract "The pKa values of HF, HCOOH, CH3COOH, CH3CH2COOH, H2CO3, HOCl, NH4+, CH3NH3+, H2O2, and CH3CH2OH in aqueous solution were predicted by QM/MM-MD in combination with umbrella samplings adopting the flexible asymmetric coordinate (FAC). This unique combination yielded remarkably accurate values with the maximum and root-mean-square errors of 0.45 and 0.22 in pKa units, respectively, without any numerical or experimental adjustments. The stability of the initially formed Coulomb pair rather than the proton transfer stage turned out to be the rate-determining step, implying that the stabilizations of the created ions require a large free energy increase. A remarkable correlation between DWR (degree of water rearrangements) and pKa was observed. As such, the large pKa of ethanol can be, in part, attributed to the large water rearrangement, strongly suggesting that proper samplings of water dynamics at dissociated regions are critical for accurate predictions of pKa. Current results exhibit a promising protocol for direct and accurate predictions of pKa. The significant variations in the gas phase deprotonation energies with level of theory appear to be mostly canceled by the similar changes in the averaged solute–solvent interactions, yielding accurate results." @default.
• W2020368212 created "2016-06-24" @default.
• W2020368212 creator A5003906481 @default.
• W2020368212 creator A5053938289 @default.
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• W2020368212 date "2013-05-08" @default.
• W2020368212 modified "2023-10-13" @default.
• W2020368212 title "Direct Absolute p<i>K</i>_a Predictions and Proton Transfer Mechanisms of Small Molecules in Aqueous Solution by QM/MM-MD" @default.
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• W2020368212 doi "https://doi.org/10.1021/jp400180x" @default.
• W2020368212 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23600447" @default.
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