arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1802.08771cond-mat.mtrl-sciphysics.chem-ph
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用于金属有机框架建模的原子电荷:为什么和如何

Atomic charges for modeling metal-organic frameworks: Why and how

Said Hamad, Salvador R. G. Balestra, Rocio Bueno-Perez, Sofia Calero, A. Rabdel Ruiz-Salvador

摘要:

原子部分电荷是模拟金属-有机框架(MOFs)中的关键重要参数,因为库仑相互作用随着距离的减小比范德华相互作用更慢。但是,尽管它的相关性,没有方法可以明确地分配电荷给每个原子,因为原子电荷不是量子可观测的。有几种方法可以计算原子电荷,其中大多数从波函数或电子密度或系统开始,如量子力学计算所获得的。在这项工作中,我们描述了最常用的方法来计算原子电荷的MOFs。为了显示即使是很小的结构变化对原子电荷的影响,我们给出了我们对DMOF-1获得的结果。我们还讨论了原子电荷的小变化对预测的结构性质IRMOF-1的影响。

英文摘要:

Atomic partial charges are parameters of key importance in the simulation of Metal-Organic Frameworks (MOFs), since Coulombic interactions decrease with the distance more slowly than van der Waals interactions. But despite its relevance, there is no method to unambiguously assign charges to each atom, since atomic charges are not quantum observables. There are several methods that allow the calculation of atomic charges, most of them starting from the wavefunction or the electronic density or the system, as obtained with quantum mechanical calculations. In this work, we describe the most common methods employed to calculate atomic charges in MOFs. In order to show the influence that even small variations of structure have on atomic charges, we present the results that we obtained for DMOF-1. We also discuss the effect that small variations of atomic charges have on the predicted structural properties IRMOF-1.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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