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Controlling the Formation of Benzoic Acid: Isonicotinamide Molecular Complexes

机译:控制苯甲酸的形成:异烟酰胺分子配合物

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摘要

The formation of crystalline molecular complexes of benzoic acid and isonicotinamide with 1: 1 and 2:1 compositions has been investigated through solution cocrystallization. The 1:1 complex was solely obtained from ethanol solutions, while either complex could be grown from aqueous and methanol solution by variation of the initial composition. The crystal structures of the 2:1 complex and a monohydrate of isonicotinamide were determined by single crystal X-ray diffraction. The intermolecular interactions in the crystal structure of the complex were compared with other published carboxylic acid:isonicotinamide molecular complexes, which highlights the robust nature of the acid center dot center dot center dot pyridine and acid center dot center dot center dot amide hydrogen bond, which exist in most cases. Complementary computational studies into the binding of pairs of these molecules by ab initio calculations were found to support the experimental observations and highlight the role of solvent in controlling the final crystalline form for multicomponent systems, through altering the hierarchy of intermolecular interactions.
机译:通过溶液共结晶研究了苯甲酸和异烟酰胺具有1:1和2:1组成的结晶分子复合物的形成。 1:1配合物仅从乙醇溶液中获得,而两种配合物均可通过改变初始组成从水溶液和甲醇溶液中生长。通过单晶X射线衍射确定2:1配合物和异烟酰胺一水合物的晶体结构。将配合物晶体结构中的分子间相互作用与其他已发表的羧酸:异烟酰胺酰胺分子配合物进行了比较,这突出了酸中心点中心点中心吡啶和酸中心点中心点中心氢键的鲁棒性。在大多数情况下都存在。通过从头算来对这些分子对进行结合的补充计算研究被发现可以支持实验观察,并通过改变分子间相互作用的层次,突出了溶剂在控制多组分系统最终晶型中的作用。

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