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- W1977392669 abstract "The hydration enthalpy and Gibbs free energy of proton and hydroxide are calculated by means of a combination of ab initio density functional theory and a polarizable continuum model within the self-consistent reaction field method. The ion–water cluster models here used include up to 13 water molecules solvating the ions. This allows the first and second solvation shells to be described explicitly from first principles. Vibrational contributions to the enthalpy and entropy have been taken into account. Our best model of the hydrated proton includes three molecules in the first hydration shell and nine molecules in the second shell. The calculated proton hydration enthalpy is ≈−1150 kJ/mol, which is in rather good agreement with the most recent results from cluster–ion solvation data. The hydration free energy of the proton has a larger error of ≈50–80 kJ/mol as compared to recently reported values. The calculated hydroxide hydration enthalpy, ≈−520 kJ/mol, and hydration free energy, ≈−400 kJ/mol, are consistent with well-established values taken from experiment. Two different sources of error in our calculations, namely, the nature of the hydrated complex and the outlying charge correction, are discussed. Moreover, we compare the results from three slightly different methods for the calculation of hydration energies." @default.
- W1977392669 created "2016-06-24" @default.
- W1977392669 creator A5031492875 @default.
- W1977392669 creator A5047527060 @default.
- W1977392669 date "2000-11-01" @default.
- W1977392669 modified "2023-10-18" @default.
- W1977392669 title "Calculation of the absolute hydration enthalpy and free energy of H+ and OH−" @default.
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- W1977392669 doi "https://doi.org/10.1063/1.1313793" @default.
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