Accurate and Efficient Model Energies for Exploring Intermolecular Interactions in Molecular Crystals
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- 作者：Michael J. Turner ; Simon Grabowsky ; Dylan Jayatilaka ; Mark A. Spackman
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2014
- 出版时间：December 18, 2014
- 年：2014
- 卷：5
- 期：24
- 页码：4249-4255
- 全文大小：438K
- ISSN：1948-7185
文摘
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 Grimme鈥檚 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鈥? 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鈥? for a combined data set including Hobza鈥檚 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.