Journal
NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-021-24119-3
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Funding
- PRACE aisbl [NN9914K]
- NIH [R01GM118697]
- National Centre of Competence in Research (NCCR) Materials Revolution: Computational Design and Discovery of Novel Materials (MARVEL) of the Swiss National Science Foundation (SNSF)
- New National Excellence Program of the Ministry for Innovation and Technology [UNKP-19-4, UNKP-20-5]
- Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences
- Alexander von Humboldt foundation
- National Research, Development, and Innovation Office (NKFIH) [KKP126451]
- NRDI Fund (TKP2020 IES) under Ministry for Innovation and Technology [BME-IE-BIO]
- European Research Council (ERC-CoG grant BeStMo)
- Fonds National de la Recherche Luxembourg (FNR) [INTER/DFG/18/12944860]
- Leverhulme Trust [RPG-2020-038]
- Engineering and Physical Sciences Research Council [EP/P020259/1]
- Science and Technology Facilities Council
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Quantum-mechanical methods are widely employed for describing molecular interactions, but discrepancies between CCSD(T) and DMC interaction energies for a set of polarizable supramolecules call for further collaborative efforts to resolve this issue.
Quantum-mechanical methods are used for understanding molecular interactions throughout the natural sciences. Quantum diffusion Monte Carlo (DMC) and coupled cluster with single, double, and perturbative triple excitations [CCSD(T)] are state-of-the-art trusted wavefunction methods that have been shown to yield accurate interaction energies for small organic molecules. These methods provide valuable reference information for widely-used semi-empirical and machine learning potentials, especially where experimental information is scarce. However, agreement for systems beyond small molecules is a crucial remaining milestone for cementing the benchmark accuracy of these methods. We show that CCSD(T) and DMC interaction energies are not consistent for a set of polarizable supramolecules. Whilst there is agreement for some of the complexes, in a few key systems disagreements of up to 8 kcal mol(-1) remain. These findings thus indicate that more caution is required when aiming at reproducible non-covalent interactions between extended molecules. Quantum-mechanical methods of benchmark quality are widely used for describing molecular interactions. The present work shows that interaction energies by CCSD(T) and DMC are not in consistent agreement for a set of polarizable supramolecules calling for cooperative efforts solving this conundrum.
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