用溶解参数模型对其分离性质的表征赋予的甲酸描述符的影响
1Department of Chemistry, Wayne State University, Detroit, MI 48202, USA.
Journal of chromatography. A
|August 18, 2023
概括
来自韦恩州立大学 (WSU) 的新甲酸描述器显示,与亚伯拉罕描述器相比,在预测溶解参数方面的准确性有所提高. 这些WSU描述符更好地模拟相互作用,增强染色体和分区系统中甲酸盐的预测.
科学领域:
- 化学热力学化学热力学
- 量化结构与财产关系 (QSPR)
- 染色学和分离科学 染色学和分离科学
背景情况:
- 甲酸乙被广泛使用,因此需要准确的预测模型来预测它们的行为.
- 现有的描述器数据库,如亚伯拉罕描述器,可能在准确地表示甲酸相互作用方面存在局限性.
- 溶解参数模型需要精确描述空腔形成,分散和双极类型相互作用.
研究的目的:
- 在韦恩州立大学 (WSU) 化合物描述器数据库中开发和验证甲酸盐的修订描述器.
- 为了比较WSU描述器与亚伯拉罕描述器对甲酸的预测性能.
- 评估不同分子间相互作用 (腔,分散,双极,键基本性) 对实验保留因子和分离常数的贡献.
主要方法:
- 为溶解参数模型确定15个甲酸的修订描述符.
- 气相色谱使用SPB-Octyl和DB-225静止相来获得保留因子 (log k).
- 在水态双相和n-heptane-2,2,2-trifluoroethanol系统中对分离常数的评估.
- 使用WSU和亚伯拉罕描述符对实验数据与预测进行比较分析.
主要成果:
- 与亚伯拉罕描述符相比,WSU描述符的平均绝对偏差 (AAD) 在气色谱保留因子和分区常数方面显著较低.
- WSU描述器更适合空腔,分散和二极管类型相互作用,而亚伯拉罕描述器系统地预测过多的空腔/分散和预测不足的二极管相互作用.
- WSU描述器准确地预测了分区常数,其AAD为0.063 (赫 / 三乙醇) 和0.13 (八醇 / 水),超过了亚伯拉罕描述器 (0.320和0.25分别).
结论:
- 修订后的WSU描述符提供了在分离系统和分区行为中更准确地表示甲酸乙烯属性.
- WSU描述符为甲酸的亚伯拉罕描述符提供了一个优越的替代方案,没有极端的预测值.
- 精确的键基本性的建模对于精确预测酸盐的分离常数至关重要.
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