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Effect of Substituent Size and Isomerization on the Polymorphism of 2-(Naphthalenylamino)-benzoic Acids
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2019-04-10 00:00:00 , DOI: 10.1021/acs.cgd.8b01902
Yuting Liu 1 , Mingtao Zhang 2 , Danrui Xu 1 , Sean Parkin 3 , Tonglei Li 4 , Conggang Li 5 , Zhaoyong Yang 6 , Faquan Yu 1 , Sihui Long 1
Affiliation  

To probe the effect of substituent size and isomerization on the polymorphism of fenamic acid (FA) derivatives, we synthesized two FA analogues, namely, 2-(naphthalen-1-ylamino)-benzoic acid and 2-(naphthalen-2-ylamino)-benzoic acid (NBAs), and investigated their polymorphism. Contrary to the lack of polymorphism in FA, we discovered two crystal forms (1-I, 1-II, 2-I, and 2-II) for each of the two compounds. We characterized the two polymorphic systems with single-crystal X-ray diffraction, powder X-ray diffraction, and infrared and Raman spectroscopy, and observed certain structural similarities between 1-I and 2-I. The phase behavior of these two systems were studied with differential scanning calorimetry. Computational studies such as the search for stable conformers, lattice-energy calculations, and Hirshfeld surface analysis were performed to shed light on the polymorphism, relative stability of the forms in each system, and contribution of intermolecular interactions to the overall stability of the systems. The study confirmed the effect of substituent size on the polymorphism of the compounds.

中文翻译:

取代基的大小和异构化对2-(萘基氨基)-苯甲酸多态性的影响

为了探讨取代基大小和异构化对芬那酸(FA)衍生物多态性的影响,我们合成了两个FA类似物,即2-(萘-1-基氨基)-苯甲酸和2-(萘-2-基氨基) -苯甲酸(NBAs),并研究了它们的多态性。与FA中缺乏多态性相反,我们发现两种化合物中的每一种都有两种晶型(1-I1-II2-I2-II)。我们用单晶X射线衍射,粉末X射线衍射以及红外和拉曼光谱对两种多态系统进行了表征,并观察到1-I2-I之间的某些结构相似性。用差示扫描量热法研究了这两个系统的相行为。进行了计算研究,例如寻找稳定的构象异构体,晶格能量计算和Hirshfeld表面分析,以阐明多态性,每个系统中形式的相对稳定性以及分子间相互作用对系统整体稳定性的影响。该研究证实了取代基大小对化合物多态性的影响。
更新日期:2019-04-10
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