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首页> 外文期刊>Crystal growth & design >Wohler and Liebig Revisited: 176 Years of Polymorphism in Benzamide - and the Story Still Continues!
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Wohler and Liebig Revisited: 176 Years of Polymorphism in Benzamide - and the Story Still Continues!

机译:沃勒和利比希再访:苯甲酰胺的176年多态性-故事还在继续!

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摘要

In 1832, Friedrich Wohler and Justus von Liebig described the existence of polymorphism in molecular crystals for the first time in the case of benzamide. 175 years later, the crystal structure of this historical polymorph could be finally solved. Surprising similarities regarding the packing motifs between all three known forms can be found. According to Ostwald's rule. high supersaturations are needed to crystallize the most unstable Form II from solution. Herein we present a way in which all three known forms for benzamide can be concomitantly crystallized Out of solution. With this trimorphic mixture at hand, a more detailed stability test could he performed and further characterization applying solid-state NMR-, Raman, and IR-spectroscopy was possible.
机译:1832年,Friedrich Wohler和Justus von Liebig首次描述了在苯甲酰胺情况下分子晶体中多态性的存在。 175年后,这种历史多晶型物的晶体结构最终得以解决。可以找到关于所有三种已知形式之间的包装图案的惊人相似之处。根据奥斯特瓦尔德的规则。需要高过饱和度才能从溶液中结晶出最不稳定的晶型II。本文中,我们提出了一种方法,其中所有三种已知形式的苯甲酰胺都可以从溶液中同时结晶出来。有了这种三态混合物,就可以进行更详细的稳定性测试,并且可以使用固态NMR,拉曼光谱和IR光谱进行进一步表征。

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