评估计算方法来计算五个成员的异环分子的维数的结合能
Alhadji Malloum1,2, Jeanet Conradie1
1Department of Chemistry, University of the Free State, PO BOX 339, Bloemfontein 9300, South Africa.
The journal of physical chemistry. A
|December 11, 2024
概括
计算方法准确地预测了五个成员的异环二次体的结合能. DLPNO-CCSD ((T) /CBS和B2K-PLYP方法表现出色,为未来的研究提供可靠的工具.
科学领域:
- 计算化学计算化学
- 量子化学 是一个量子化学.
- 理论化学 理论化学
背景情况:
- 准确计算结合能量对于理解分子相互作用至关重要.
- 五个成员的异环系统在各种化学和生物环境中都很重要.
- 评估计算方法的性能对于可靠的预测至关重要.
研究的目的:
- 评估各种计算电子结构方法的准确性,以计算14个五成员异环二次体的结合能.
- 为了比较ab initio方法和密度函数理论 (DFT) 函数的性能.
- 识别可靠和准确的计算方法,用于未来对此类系统的研究.
主要方法:
- 使用了ab initio方法 (例如DLPNO-CCSD(T) /CBS) 和密度函数理论 (DFT) 函数.
- 使用经典分子动力学生成分子配置,并在MP2/aug-cc-pVTZ水平上进行优化.
- 基准绑定能量是使用高度准确的CCSD (T) /CBS理论水平来计算的.
主要成果:
- DLPNO-CCSD(T) /CBS方法密切地复制了基准结果,平均绝对偏差 (MAD) 为0.17kcal/mol.
- 一种方案式的CCSD (T) /CBS方法实现了0.08 kcal/mol的优秀MAD.
- DFT函数,特别是双混合函数,如B2K-PLYP (0.25 kcal/mol的MAD) 和其他包括分散校正 (例如M05-D3) 的函数,显示出高精度.
结论:
- 对于这些系统,DLPNO-CCSD(T) /CBS方法是一个非常准确的初始方法.
- DFT功能器,特别是带有分散校正的双混合型,提供了可靠和具有成本效益的替代方案.
- 一些DFT函数 (B2K-PLYP,M05-D3,B97D等等) 的使用. 建议在未来对五个成员的异环集群进行调查.
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