在水溶性自组装囊中模拟基复合的混合显式隐式溶解方法
Henrik Daver1, Andrés G Algarra2, Julius Rebek3,4
1Department of Organic Chemistry, Arrhenius Laboratory , Stockholm University , SE-106 91 Stockholm , Sweden.
Journal of the American Chemical Society
|September 7, 2018
概括
计算化学准确地预测了基于的洞膜如何在水中结合疏水客. 一个精细的溶解模型改善了结合的自由能量计算,与1:1和2:1复合物的实验趋势相匹配.
科学领域:
- 超分子化学
- 计算化学
- 物理化学
背景情况:
- 基于Resorcinarene的体是已知的水溶性分子,可以与疏水性客体形成宿主-客体复合体.
- 实验研究表明,这些腔体自组合成1:1和2:1的复合物与n-基,其固态度取决于基链长度.
- 准确的理论预测这些结合性质对于理解水环境中的分子识别至关重要.
研究的目的:
- 评估标准量子化学方法的准确性,以预测水中的酸洞体的宿主-客体结合性质.
- 识别现有计算协议中的错误来源.
- 开发一种改进的计算方法,用于准确预测结合亲和度和固体测量.
主要方法:
- 用密度功能理论 (DFT) 的计算来研究宿主-客结合.
- 一个先进的计算协议 (B3LYP-D3 ((BJ) 6-311+G ((2d,2p) 与COSMO-RS和准刚性旋转器和振器) 最初被评估.
- 通过对热中性水集群形成的水化自由能量进行参数化,开发了一种新的混合显式隐式溶解协议并进行验证.
主要成果:
- 标准的先进计算协议在预测结合自由能量方面表现出显著的错误.
- 系统分析显示隐性解法模型是主要的错误来源.
- 开发的混合溶解方案显示了重大改进,准确地复制了1:1对2:1的主/客结合趋势的n-基.
结论:
- 标准隐性溶解模型不足以准确地描述涉及酸腔体的水溶液中的宿主-客体复合.
- 一种精细的混合显式隐式解决方法显著提高了DFT对此类系统的预测能力.
- 改进的方法为了解和设计水中的分子识别过程提供了可靠的工具.
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