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      Ruthenabenzene: A Robust Precatalyst

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          Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density

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            Density-functional thermochemistry. III. The role of exact exchange

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              Effect of the damping function in dispersion corrected density functional theory.

              It is shown by an extensive benchmark on molecular energy data that the mathematical form of the damping function in DFT-D methods has only a minor impact on the quality of the results. For 12 different functionals, a standard "zero-damping" formula and rational damping to finite values for small interatomic distances according to Becke and Johnson (BJ-damping) has been tested. The same (DFT-D3) scheme for the computation of the dispersion coefficients is used. The BJ-damping requires one fit parameter more for each functional (three instead of two) but has the advantage of avoiding repulsive interatomic forces at shorter distances. With BJ-damping better results for nonbonded distances and more clear effects of intramolecular dispersion in four representative molecular structures are found. For the noncovalently-bonded structures in the S22 set, both schemes lead to very similar intermolecular distances. For noncovalent interaction energies BJ-damping performs slightly better but both variants can be recommended in general. The exception to this is Hartree-Fock that can be recommended only in the BJ-variant and which is then close to the accuracy of corrected GGAs for non-covalent interactions. According to the thermodynamic benchmarks BJ-damping is more accurate especially for medium-range electron correlation problems and only small and practically insignificant double-counting effects are observed. It seems to provide a physically correct short-range behavior of correlation/dispersion even with unmodified standard functionals. In any case, the differences between the two methods are much smaller than the overall dispersion effect and often also smaller than the influence of the underlying density functional. Copyright © 2011 Wiley Periodicals, Inc.
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                Author and article information

                Contributors
                Journal
                Journal of the American Chemical Society
                J. Am. Chem. Soc.
                American Chemical Society (ACS)
                0002-7863
                1520-5126
                May 19 2021
                May 07 2021
                May 19 2021
                : 143
                : 19
                : 7490-7500
                Affiliations
                [1 ]Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor St., Chicago, Illinois 60607, United States
                [2 ]Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
                Article
                10.1021/jacs.1c02237
                33961744
                10174437-620c-41c9-8021-85ed0c319199
                © 2021

                https://doi.org/10.15223/policy-029

                https://doi.org/10.15223/policy-037

                https://doi.org/10.15223/policy-045

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