Accurate and efficient model energies for exploring intermolecular interactions in molecular crystals

Michael Turner, Simon Grabowsky, Dylan Jayatilaka, Mark Spackman

Research output: Contribution to journalArticle

166 Citations (Scopus)
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Abstract

© 2014 American Chemical Society. The energy of interaction between molecules is commonly expressed in terms of four key components: electrostatic, polarization, dispersion, and exchange-repulsion. Using monomer wave functions to obtain accurate estimates of electrostatic, polarization, and repulsion energies along with Grimmes dispersion corrections, a series of energy models are derived by fitting to dispersion-corrected DFT energies for a large number of molecular pairs extracted from organic and inorganic molecular crystals. The best performing model reproduces B3LYP-D2/6-31G(d,p) counterpoise-corrected energies with a mean absolute deviation (MAD) of just over 1 kJ mol-1 but in considerably less computation time. It also performs surprisingly well against benchmark CCSD(T)/CBS energies, with a MAD of 2.5 kJ mol-1 for a combined data set including Hobzas X40, S22, A24, and S66 dimers. Two of these energy models, the most accurate and the fastest, are expected to find widespread application in investigations of molecular crystals.
Original languageEnglish
Pages (from-to)4249-4255
JournalJournal of Physical Chemistry Letters
Volume5
Issue number24
Early online date25 Nov 2014
DOIs
Publication statusPublished - 18 Dec 2014

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