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Piecewise Multipole-Expansion Implicit Solvation for Arbitrarily Shaped Molecular Solutes

Title data

Filser, Jakob ; Reuter, Karsten ; Oberhofer, Harald:
Piecewise Multipole-Expansion Implicit Solvation for Arbitrarily Shaped Molecular Solutes.
In: Journal of Chemical Theory and Computation. Vol. 18 (2022) Issue 1 . - pp. 461-478.
ISSN 1549-9626
DOI: https://doi.org/10.1021/acs.jctc.1c00834

Project information

Project financing: Bayerisches Staatsministerium für Wissenschaft, Forschung und Kunst
Forschungsinitiative "Solar Technologies go Hybrid"

Abstract in another language

The multipole-expansion (MPE) model is an implicit solvation model used to efficiently incorporate solvent effects in quantum chemistry. Even within the recent direct approach, the multipole basis used in MPE to express the dielectric response still solves the electrostatic problem inefficiently or not at all for solutes larger than approximately ten non-hydrogen atoms. In existing MPE parametrizations, the resulting systematic underestimation of the electrostatic solute–solvent interaction is presently compensated for by a systematic overestimation of nonelectrostatic attractive interactions. Even though the MPE model can thus reproduce experimental free energies of solvation of small molecules remarkably well, the inherent error cancellation makes it hard to assign physical meaning to the individual free-energy terms in the model, raising concerns about transferability. Here we resolve this issue by solving the electrostatic problem piecewise in 3D regions centered around all non-hydrogen nuclei of the solute, ensuring reliable convergence of the multipole series. The resulting method thus allows for a much improved reproduction of the dielectric response of a medium to a solute. Employing a reduced nonelectrostatic model with a single free parameter, in addition to the density isovalue defining the solvation cavity, our method yields free energies of solvation of neutral, anionic, and cationic solutes in water in good agreement with experiment.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Electrostatics, Solvation; Implicit Solvation; Electronic Density Functional Theory
Institutions of the University: Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics VII - Computational Materials Design (BayBatt)
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics VII - Computational Materials Design (BayBatt) > Chair Theoretical Physics VII - Computational Materials Design (BayBatt) - Univ.-Prof. Dr. Harald Oberhofer
Research Institutions > Research Centres > Bayerisches Zentrum für Batterietechnik - BayBatt
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: No
DDC Subjects: 500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 26 Jan 2022 14:42
Last Modified: 23 Feb 2022 08:46
URI: https://eref.uni-bayreuth.de/id/eprint/68505