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在百原子尺度上对纳米级非共价复合体的法定合集束结合基准
1Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, USA.
The Journal of chemical physics
|December 16, 2024
概括
这项研究介绍了纳米级非共价结合的大规模数据集,比较方法,如与单,双和扰乱三重 [CCSD (T) ] 激发的合集群. 结果显示,固定节点扩散蒙特卡洛低估了π-π复合体中的结合能.
科学领域:
- 计算化学是一种计算化学.
- 量子化学是一种量子化学.
- 材料科学是一种材料科学.
背景情况:
- 准确预测非共价结合对于理解分子相互作用至关重要.
- 对于大型分子复合体的现有基准是有限的.
- 结合集群与单一,双重和扰动性三重[CCSD(T) ]激发被推断到完整的基础集 (CBS) 极限是一个高精度的方法.
研究的目的:
- 创建和比较纳米级非共价结合的数据集.
- 评估大型系统的计算方法的准确性.
- 确定可靠的方法来研究非共价相互作用.
主要方法:
- 开发两个数据集 (L14和vL11),用于纳米级非共价结合.
- 使用规范和局部合集群的基准测试,将单一,双重和扰动性三重[CCSD(T) ]激发推算到完整的基础集 (CBS) 极限.
- 与固定节点扩散蒙特卡洛 (FN-DMC) 的比较以及其他电子结构方法的评估.
主要成果:
- 正规的CCSDT/CBS基准扩展到113个原子,当地CCSDT/CBS扩展到174个原子.
- 当地的CCSD (T) /CBS显示与正规的CCSD (T) /CBS有很好的协议.
- 固定节点扩散蒙特卡罗 (FN-DMC) 低估了π-π复合体中的约束能超过1kcal/mol.
- 建议MP2+aiD(CCD),PBE0+D4和oB97X-3c用于纳米级非共价相互作用.
结论:
- 在FN-DMC中的固定节点近似需要进一步调查具有约束力的差异.
- 推方法 (MP2+aiD(CCD),PBE0+D4, ωB97X-3c) 为纳米系统提供了准确性和计算效率的平衡.
- 开发的数据集作为未来计算化学研究的宝贵参考.
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