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arXiv 2108.11228physics.chem-phcond-mat.otherphysics.comp-ph
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子系统密度泛函理论中的溶剂化自由能

Solvation Free Energies in Subsystem Density Functional Theory

Moritz Bensberg, Paul L. Türtscher, Jan P. Unsleber, Markus Reiher, Johannes Neugebauer

摘要:

对于许多化学过程,溶剂效应的准确描述是至关重要的。在这里,我们描述了一个混合分析的基础上,子系统密度泛函理论和连续溶剂化方案的溶质-溶剂和溶剂-溶剂相互作用的明确的量子力学描述。由于明确的溶剂分子可能会损害模型的可扩展性和预测的溶剂效应的可转移性,我们的目标是保留两者,对于不同的溶质以及不同的溶剂。传递性的关键是溶质和溶剂的子系统分解的一致性。可扩展性的关键是子系统DFT的性能,以增加子系统的数量。我们调查分子动力学和固定点采样的溶剂配置和比较所产生的(吉布斯)自由能的实验和理论方法。我们可以表明,与实验数据相比,我们的混合模型反应势垒和反应能准确地再现。

英文摘要:

For many chemical processes the accurate description of solvent effects are vitally important. Here, we describe a hybrid ansatz for the explicit quantum mechanical description of solute-solvent and solvent-solvent interactions based on subsystem density functional theory and continuum solvation schemes. Since explicit solvent molecules may compromise scalability of the model and transferability of the predicted solvent effect, we aim to retain both, for different solutes as well as for different solvents. The key for the transferability is the consistent subsystem decomposition of solute and solvent. The key for the scalability is the performance of subsystem DFT for increasing numbers of subsystems. We investigate molecular dynamics and stationary point sampling of solvent configurations and compare the resulting (Gibbs) free energies to experiment and theoretical methods. We can show that with our hybrid model reaction barriers and reaction energies are accurately reproduced compared to experimental data.

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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