Issue 29, 2023

The treatment of dispersion terms for solution systems

Abstract

DFT calculations of reaction mechanisms in solution have always been a hot topic, especially for transition-metal-catalyzed reactions, in which the traditional DFT-D3 method has been extensively employed. The overestimation of the dispersion from the traditional DFT-D3 method leads to a quite low activation free-energy barrier, so it is worth finding a proper way to deal with the dispersion for solution systems. The solvent–solute dispersion is also important for solution systems, and thus it should be calculated together with the solute dispersion. The newly generated solute–solute dispersion energy should be shared equally with the newly formed cavity between two interacting species; therefore, only half of the solute–solute and solvent–solute dispersion terms belong to the solute molecule. The detailed treatment of dispersion correction for solution systems has been fully addressed, and this method has been confirmed with the examples of ligand exchange reactions and catalytic reactions.

Graphical abstract: The treatment of dispersion terms for solution systems

Supplementary files

Article information

Article type
Communication
Submitted
12 Jun. 2023
Accepted
06 Jul. 2023
First published
07 Jul. 2023

Phys. Chem. Chem. Phys., 2023,25, 19422-19426

The treatment of dispersion terms for solution systems

D. Fang, S. Liu, D. Liu and X. Zhu, Phys. Chem. Chem. Phys., 2023, 25, 19422 DOI: 10.1039/D3CP02733C

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