Intermolecular vibrations are extremely challenging to describe but are the most crucial part for determining entropy and hence free energies and enable, for instance, the distinction between different crystal-packing arrangements of the same molecule via THz spectroscopy. Herein, we introduce a benchmark dataset—V30—containing 30 small molecular dimers with intermolecular interactions ranging from exclusively van der Waals dispersion to systems with hydrogen bonds. All the calculations are performed with the gold standard of quantum chemistry CCSD(T). We discuss vibrational frequencies obtained via different models starting with the harmonic approximation over independent Morse oscillators up to second-order vibrational perturbation theory (VPT2), which allows a proper anharmonic treatment including coupling of vibrational modes. However, large amplitude motions present in many low-frequency intermolecular modes are problematic for VPT2. In analogy to the often used treatment for internal rotations, we replace such problematic modes by a simple one-dimensional hindered rotor model. We compare selected dimers to the available experimental data or high-level calculations of potential energy surfaces and show that VPT2 in combination with hindered rotors can yield a very good description of fundamental frequencies for the discussed subset of dimers involving small and semi-rigid molecules.
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21 December 2024
Research Article|
December 18 2024
The V30 benchmark set for anharmonic vibrational frequencies of molecular dimers
Special Collection:
2024 JCP Emerging Investigators Special Collection
Johannes Hoja
;
Johannes Hoja
a)
(Conceptualization, Data curation, Funding acquisition, Investigation, Validation, Writing – original draft, Writing – review & editing)
Department of Chemistry, University of Graz
, Heinrichstraße 28/IV, 8010 Graz, Austria
a)Author to whom correspondence should be addressed: [email protected]
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A. Daniel Boese
A. Daniel Boese
(Conceptualization, Resources, Validation, Writing – review & editing)
Department of Chemistry, University of Graz
, Heinrichstraße 28/IV, 8010 Graz, Austria
Search for other works by this author on:
Johannes Hoja
a)
A. Daniel Boese
Department of Chemistry, University of Graz
, Heinrichstraße 28/IV, 8010 Graz, Austria
a)Author to whom correspondence should be addressed: [email protected]
J. Chem. Phys. 161, 234110 (2024)
Article history
Received:
September 12 2024
Accepted:
November 25 2024
Citation
Johannes Hoja, A. Daniel Boese; The V30 benchmark set for anharmonic vibrational frequencies of molecular dimers. J. Chem. Phys. 21 December 2024; 161 (23): 234110. https://doi.org/10.1063/5.0238491
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