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Predicting Multicomponent Crystal Formation: The Interplay between Homomeric and Heteromeric Interactions

机译:预测多组分晶体的形成:同质和异质相互作用之间的相互作用

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摘要

Current approaches to improving physicochemical properties without changing desirable therapeutic behavior of active pharmaceutical ingredients include formation of multicomponent crystals such as salts and cocrystals. We report a technique that can provide a priori prediction for multicomponent crystal formation based on intermolecular pair interactions characterized using pulsed gradient spin-echo nuclear magnetic resonance (PGSE NMR). The accuracy of our prediction technique in comparison to the well-adopted Delta pK(a) rule of thumb is tested against 25 molecular pairs including protonated amines, nitrogen-protonated heterocyclic bases, phenols, and carboxylic acids dissolved in six solvents. While the Delta pK(a) rule results in numerous contradicting exceptions, our technique robustly predicts multicomponent crystal formation. These results reveal that the application of PGSE NMR for determining the self-diffusivities of molecules and subsequently the strengths of intermolecular interactions has the potential to be developed into a standard and robust protocol for the study of multicomponent solution chemistry.
机译:在不改变活性药物成分的理想治疗行为的情况下,改善物理化学性质的当前方法包括形成多组分晶体,例如盐和共晶体。我们报告了一种技术,该技术可基于使用脉冲梯度自旋回波核磁共振(PGSE NMR)表征的分子间对相互作用为多组分晶体形成提供先验预测。我们针对25种分子对测试了我们的预测技术与公认的Delta pK(a)经验法则相比的准确性,其中包括溶解在六种溶剂中的质子化胺,氮质子化的杂环碱,苯酚和羧酸。尽管Delta pK(a)规则导致许多相互矛盾的例外,但我们的技术强有力地预测了多组分晶体的形成。这些结果表明,PGSE NMR在确定分子的自扩散性以及随后的分子间相互作用强度方面的应用有可能被发展成为用于研究多组分溶液化学的标准且鲁棒的方案。

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