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arXiv 2503.02423physics.chem-ph
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四重氢键的密度泛函基准测试

Density functional benchmark for quadruple hydrogen bonds

Usman Ahmed, Mikael P. Johansson, Susi Lehtola, Dage Sundholm

AI总结:

本文以14个四重氢键二聚体的高精度耦合簇结合能为参照,系统评估152种密度泛函近似,发现经D3BJ色散校正改造的B97M-V表现最佳。

摘要:

氢键是一种重要的非共价相互作用,在分子自组织和超分子结构中发挥着重要作用。它可以通过从头算量子化学波函数方法得到准确描述,但这些方法对于大型分子组装体而言计算成本高昂。密度泛函理论(DFT)在准确性和计算成本之间提供了更好的平衡,能够常规应用于大型体系。人们已经开发了大量密度泛函近似(DFAs),但其准确性取决于具体应用,因此需要通过基准研究来指导应用中的泛函选择。我们中的部分研究者近期通过将耦合簇能量外推至完备基组极限,并采用连分数方法外推电子相关贡献,确定了14个四重氢键二聚体的高精度氢键结合能 [U. Ahmed et al., Phys. Chem. Chem. Phys., 2024, 26, 24470]。在本工作中,我们使用152种DFA在DFT层面研究了这些结合能的重现情况。排名前十的泛函包括8种含或不含色散校正的Berkeley泛函变体,以及2种附加了进一步色散校正的Minnesota 2011泛函。我们发现,将非局域相关泛函替换为经验D3BJ色散校正的B97M-V泛函是表现最好的泛函;而在本研究中,对其他Berkeley泛函的色散部分进行更改会导致性能下降。

英文摘要:

Hydrogen bonding is an important non-covalent interaction that plays a major role in molecular self-organization and supramolecular structures. It can be described accurately with ab initio quantum chemical wave function methods, which become computationally expensive for large molecular assemblies. Density functional theory (DFT) offers a better balance between accuracy and computational cost, and can be routinely applied to large systems. A large number of density functional approximations (DFAs) has been developed, but their accuracy depend on the application, necessitating benchmark studies to guide their selection for use in applications. Some of us have recently determined highly accurate hydrogen bonding energies of 14 quadruply hydrogen-bonded dimers by extrapolating coupled-cluster energies to the complete basis set limit as well as extrapolating electron correlation contributions with a continued-fraction approach [U. Ahmed et al, Phys. Chem. Chem. Phys., 2024, 26, 24470]. In this work, we study the reproduction of these bonding energies at the DFT level using 152 DFAs. The top ten functionals are composed of eight variants of the Berkeley functionals both with and without dispersion corrections, and two Minnesota 2011 functionals augmented with a further dispersion correction. We find the B97M-V functional with the non-local correlation functional replaced by an empirical D3BJ dispersion correction to be the best functional, while changes to the dispersion part in other Berkeley functionals lead to poorer performance in our study.

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