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• W2912635094 abstract "Extrapolation formulas based on power and exponential formulas, as well as alternatives from a Taylor series, were tested and used with density functional theory (DFT) for the calculation of enthalpies of formation. The following four functionals were analyzed: B3LYP, BMK, M06‐2X, and B2PLYP. Preliminary tests pointed to B2PLYP and B3LYP as the best and worst functionals, respectively. Taylor series expressions were as accurate as the power formulas and presented better performance than the exponential equation. The power formula (Equation (2)) and one of the simplest Taylor expressions (Equation (13)) were selected for the calculations with B3LYP and B2PLYP, with further empirical adjustments based on the higher level correction (HLC) and scaling of the experimental atomization energies used to calculate enthalpies of formation. HLC improved the B3LYP mean absolute error (MAE) from approximately 4.3 to 3.5 kcal mol −1 using both extrapolation alternatives. For B2PLY, the MAEs were improved from 2.7 to 2.6 kcal mol −1 . Regarding the G3/05 test set, a significant improvement in the MAEs around 2.5 and 1.5 kcal mol −1 were achieved using B3LYP and B2PLYP, respectively. The accuracy obtained from these empirical corrections was equivalent to other composite methods. The MAEs from B3LYP and B2PLYP may be suggested as ranges for the possible accuracy to be achieved by some DFT methods. The empirical corrections suggested in this work are improvements that may be considered to provide acceptable accuracy for enthalpies of formation and possibly other properties." @default.
• W2912635094 created "2019-02-21" @default.
• W2912635094 creator A5058222722 @default.
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• W2912635094 date "2019-01-22" @default.
• W2912635094 modified "2023-10-02" @default.
• W2912635094 title "Assessment of a composite method based on selected density functional theory methods and complete basis set extrapolation formulas" @default.
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• W2912635094 doi "https://doi.org/10.1002/qua.25892" @default.
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