Low-Cost Quantum Chemical Methods for Noncovalent Interactions

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• 作者：Jan Gerit Brandenburg ; Manuel Hochheim ; Thomas Bredow ; Stefan Grimme
• 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：4275-4284
• 全文大小：488K
• ISSN：1948-7185

文摘

The efficient and reasonably accurate description of noncovalent interactions is important for various areas of chemistry, ranging from supramolecular host鈥揼uest complexes and biomolecular applications to the challenging task of crystal structure prediction. While London dispersion inclusive density functional theory (DFT-D) can be applied, faster 鈥渓ow-cost鈥?methods are required for large-scale applications. In this Perspective, we present the state-of-the-art of minimal basis set, semiempirical molecular-orbital-based methods. Various levels of approximations are discussed based either on canonical Hartree鈥揊ock or on semilocal density functionals. The performance for intermolecular interactions is examined on various small to large molecular complexes and organic solids covering many different chemical groups and interaction types. We put the accuracy of low-cost methods into perspective by comparing with first-principle density functional theory results. The mean unsigned deviations of binding energies from reference data are typically 10鈥?0%, which is only two times larger than those of DFT-D. In particular, for neutral or moderately polar systems, many of the tested methods perform very well, while at the same time, computational savings of up to 2 orders of magnitude can be achieved.