计算新出现的超基和多基物质的准确键解离能:使用基于连接性的等级体系实现化学准确性
Samir Kumar Nayak1, Sharma S R K C Yamijala2
1Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036 India; Centre for Atomistic Modelling and Materials Design, Indian Institute of Technology Madras, Chennai 600036, India.
Journal of hazardous materials
|February 20, 2024
概括
本研究引入了一种修改的基于连接性的层次结构 (CBH) 方案,以准确计算和多基物质 (PFAS) 的键解离能 (BDE). 该方法为PFAS降解研究提供了高精度但资源密集的量子化学计算的计算效率高的替代方案.
科学领域:
- 环境化学环境化学
- 计算化学的计算化学
- 物理化学 物理化学
背景情况:
- 准确的键解离能 (BDE) 对于理解和设计和多基物质 (PFAS) 的降解途径至关重要.
- 对PFAS的实验BDE数据很少,传统的计算方法,如密度函数理论 (DFT) 的准确性有限.
- 高精度的量子化学方法 (例如G4) 在计算上昂贵,并且仅限于小分子系统.
研究的目的:
- 解决用于确定PFASBDE的现有计算方法的局限性.
- 开发和验证一个修改的基于连接的层次结构 (CBH) 方案,以准确有效地计算PFAS BDEs.
- 提供可靠的BDE数据,以促进制定有效的PFAS降解策略.
主要方法:
- 对计算BDE的基于连接的层次结构 (CBH) 方案的调查.
- 修改CBH方案以提高准确性.
- 通过将其结果与G4复合方法计算进行比较,验证修改后的CBH方案.
- 用G4方法计算各种PFAS化合物的基态自由能量和BDE.
主要成果:
- 修改后的CBH方案实现了与G4方法相当的BDE精度,平均绝对偏差为0.7 kcal mol-1.1.
- 修改后的CBH方案保留了DFT的计算效率,使其适用于更大的PFAS分子.
- 七个PFAS组合和44个C-C和C-F债券的计算验证了该计划的可靠性.
结论:
- 修改后的CBH方案提供了一个计算效率高,准确的方法来确定PFAS BDEs.
- 这种方法弥合了DFT的效率和高精度方法的局限性之间的差距.
- 经过验证的方案有望加速制定有效的PFAS降解策略.
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