A cost effective scheme for the highly accurate description of intermolecular binding in large complexes

0565363 - ÚMCH 2023 RIV CH eng J - Journal Article
Czernek, Jiří - Brus, Jiří - Czerneková, Vladimíra
A cost effective scheme for the highly accurate description of intermolecular binding in large complexes.
International Journal of Molecular Sciences. Roč. 23, č. 24 (2022), č. článku 15773. E-ISSN 1422-0067
R&D Projects: GA ČR(CZ) GA20-01233S
Institutional support: RVO:61389013 ; RVO:68378271
Keywords : noncovalent interactions * intermolecular binding * CCSD(T)
OECD category: Polymer science; Inorganic and nuclear chemistry (FZU-D)
Impact factor: 5.6, year: 2022
Method of publishing: Open access
https://www.mdpi.com/1422-0067/23/24/15773

There has been a growing interest in quantitative predictions of the intermolecular binding energy of large complexes. One of the most important quantum chemical techniques capable of such predictions is the domain-based local pair natural orbital (DLPNO) scheme for the coupled cluster theory with singles, doubles, and iterative triples [CCSD(T)], whose results are extrapolated to the complete basis set (CBS) limit. Here, the DLPNO-based focal-point method is devised with the aim of obtaining CBS-extrapolated values that are very close to their canonical CCSD(T)/CBS counterparts, and thus may serve for routinely checking a performance of less expensive computational methods, for example, those based on the density-functional theory (DFT). The efficacy of this method is demonstrated for several sets of noncovalent complexes with varying amounts of the electrostatics, induction, and dispersion contributions to binding (as revealed by accurate DFT-based symmetry-adapted perturbation theory (SAPT) calculations). It is shown that when applied to dimeric models of poly(3-hydroxybutyrate) chains in its two polymorphic forms, the DLPNO-CCSD(T) and DFT-SAPT computational schemes agree to within about 2 kJ/mol of an absolute value of the interaction energy. These computational schemes thus should be useful for a reliable description of factors leading to the enthalpic stabilization of extended systems.
Permanent Link: https://hdl.handle.net/11104/0337173