一个可转移的量子力学能量模型用于分子间相互作用,使用单个经验参数
Peter R Spackman1, Mark A Spackman2, Julian D Gale1
1School of Molecular and Life Sciences, Curtin University, Perth, Western Australia 6845, Australia.
IUCrJ
|October 30, 2023
概括
一个新的单参数模型 (CE-1p) 准确计算了分子晶体中的分子间相互作用. 该模型通过结合先进的分散和极化处理来改进以前的方法,为晶体特性提供可靠的预测.
科学领域:
- 计算化学是一种计算化学.
- 材料科学是一种材料科学.
- 固态物理 固态物理
背景情况:
- 了解分子间相互作用对于预测分子晶体特性至关重要.
- 现有的模型往往需要复杂的参数化,或者在各种元素中难以准确.
研究的目的:
- 为分子晶体引入一种新的,简化的单参相互作用能量模型 (CE-1p).
- 提高计算分子间力,结晶的驱动力和弹性的精度.
主要方法:
- 开发了CE-1p模型,扩展了CrystalExplorer能源模型.
- 使用密度函数理论 (DFT) 计算 (ωB97M-V/def2-QZVP) 对来自147个晶体结构的1157个相互作用进行校准模型.
- 纳入了交换孔双极模型 (XDM) 用于分散和极化,以及有效核心潜力 (ECP) 用于广泛的元素适用性 (H到Rn).
主要成果:
- CE-1p模型表现出卓越的性能,与最先进的DFT方法相美.
- 对于分子晶格能量 (X23集) 达到3.6kJ/mol的平均绝对偏差.
- 对分子间相互作用 (S66x8基准集) 显示出根平均平方偏差为3.3kJ/mol.
结论:
- CE-1p模型为计算分子晶体中的分子间相互作用提供了一种统一而准确的方法.
- 该模型的性能验证了其用于预测晶体属性的实用性,并为计算密集型DFT方法提供了有价值的替代方案.
- 为其应用和与其他模型 (如GFN2-xTB) 的比较提供了建议.
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