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首页> 外文期刊>Crystal growth & design >Polymorphism and pseudopolymorphism of an aromatic amide: Spontaneous resolution and crystal-to-crystal phase transition
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Polymorphism and pseudopolymorphism of an aromatic amide: Spontaneous resolution and crystal-to-crystal phase transition

机译：芳香族酰胺的多态性和拟多态性：自发拆分和晶体到晶体的相变

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摘要

1,2-Bis(N-p-fluorobenzoyl-N-methylamino)benzene (1) afforded 13 types of crystals upon crystallization from various solvents. Eleven of them are pseudopolymorphs that have crystallizing solvents in the crystalline lattice, whereas the others are polymorphs. Both the polymorphs and pseudopolymorphs included conformational polymorphs based on cis/trans isomerization of the amide bonds. Three of the pseudopolymorphs showed spontaneous resolution (total asymmetric transformation), belonging to the chiral space group P3(1) or P3(2). The absolute configuration of each chiral crystal was determined by single crystal X-ray analysis. Solid-state CD spectrum was also measured in the KBr matrix for the same crystal used for X-ray analysis. Phase transition between the polymorphs and pseudopolymorphs was observed by simultaneous measurement of DSC and X-ray powder diffraction.
机译：从各种溶剂中结晶后，1,2-双（N-对氟苯甲酰基-N-甲基氨基）苯（13）提供了13种晶体。它们中的十一种是在晶格中具有结晶溶剂的假多晶型物，而其他为多晶型物。基于酰胺键的顺式/反式异构化，多晶型物和假多晶型物均包括构象多晶型物。三种假多晶型物显示出自发的分辨率（总不对称转化），属于手性空间群P3（1）或P3（2）。通过单晶X射线分析确定每个手性晶体的绝对构型。对于用于X射线分析的同一晶体，还在KBr矩阵中测量了固态CD光谱。通过同时测量DSC和X射线粉末衍射观察到多晶型物和假多晶型物之间的相变。

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