描述器数据库选择对水-空气,八醇-空气和八醇-水分离常数的物理化学表征和预测的影响,使用溶解参数模型
1Department of Chemistry, Wayne State University, Detroit, MI 48202, USA.
Journal of chromatography. A
|August 11, 2023
概括
选择复合描述器数据库对具有测量不确定性的分区系数的模型性能的影响最小. 然而,它对分子间相互作用的解释有很大的影响,需要一致的数据库用于比较.
科学领域:
- 物理化学 物理化学
- 计算化学计算化学
- 化学热力学化学热力学
背景情况:
- 溶解参数模型使用六个溶解物描述器来预测双相系统中中性化合物分布.
- 两个主要的数据库 (WSU和Abraham) 管理这些描述符,但由于独立开发,它们的值有所不同.
- 之前的研究表明,WSU描述符在低不确定性染色学数据中表现优于亚伯拉罕的.
研究的目的:
- 评估WSU描述符是否在具有显著测量不确定性的分区系数中始终优于亚伯拉罕描述符.
- 评估描述符数据库选择对模型质量和预测能力的影响.
- 确定数据库选择如何影响对分子间相互作用贡献的解释.
主要方法:
- 来自多个实验室和方法的组装分区系数数据 (水-空气,八醇-空气,八醇-水).
- 使用了来自WSU和Abraham数据库的描述符的解解参数模型.
- 分析模型质量,预测能力,以及个体分子间相互作用的贡献.
主要成果:
- 数据库选择对整体模型质量和预测性能的影响最小.
- 根据使用的数据库,观察到单个分子间相互作用的计算贡献有显著差异.
- 解释特定的分子间力在很大程度上取决于所选择的描述数据库.
结论:
- 对于具有实质性测量不确定性的分区系数模型,在WSU和Abraham描述器数据库之间进行选择对预测准确度的影响很小.
- 来自特定分子间相互作用的贡献的分配是特定于数据库的.
- 系统常数的定量比较需要使用单一,一致的复合描述数据库.
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