作者:Rafel Prohens、Rafael Barbas、Anna Portell、Mercè Font-Bardia、Xavier Alcobé、Cristina Puigjaner
DOI:10.1021/acs.cgd.5b01628
日期:2016.2.3
It has been traditionally suggested that polymorphism of cocrystals is a phenomenon seen less frequently than in monocomponent crystals. However, since the research on cocrystals has recently experienced a big growth, the number of solved structures of polymorphic cocrystals in the Cambridge Structural Database has increased, which can help to understand better whether a lower impact of this phenomenon exists or not in multicomponent crystals. In this paper we describe the cocrystal landscape of agomelatine, a particularly promiscuous drug able to cocrystallize with up to nine different coformers. Interestingly, two of those coformers have produced polymorphic cocrystals during the screening, which converts agomelatine into a new example that questions the traditional belief of the lesser impact of polymorphism in cocrystals and highlights the importance of polymorphism studies in cocrystal screening. Our work is completed with the determination of the crystal structures of the new forms from combined single crystal/laboratory X-ray powder diffraction data.
传统观点认为,与单组分晶体相比,共晶体的多态性是一种不太常见的现象。然而,由于近年来对共晶体的研究有了长足的发展,剑桥结构数据库(Cambridge Structural Database)中已解决的多态共晶体结构的数量有所增加,这有助于更好地理解多组分晶体中是否存在这种影响较小的现象。在本文中,我们描述了阿戈美拉汀(agomelatine)的共晶体图谱,这是一种特别杂乱的药物,能够与多达九种不同的共形体共晶体。有趣的是,其中两种共聚物在筛选过程中产生了多态共晶,这使阿戈美拉汀成为一个新的例子,质疑了多态性对共晶影响较小的传统观点,并强调了多态性研究在共晶筛选中的重要性。根据单晶/实验室 X 射线粉末衍射数据,我们确定了新形式的晶体结构,从而完成了这项工作。