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首页> 外文期刊>Crystal growth & design >Solubility Equilibria and Crystallographic Characterization of the L-Threonine/L-allo-Threonine System, Part 2: Crystallographic Characterization of Solid Solutions in the Threonine Diastereomeric System
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Solubility Equilibria and Crystallographic Characterization of the L-Threonine/L-allo-Threonine System, Part 2: Crystallographic Characterization of Solid Solutions in the Threonine Diastereomeric System

机译：L-苏氨酸/ L-苏氨酸系统的溶解度平衡和晶体学表征，第2部分：苏氨酸非对映异构体中固溶体的晶体学表征

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摘要

Features of crystal structures and their thermal deformations in the L-threonine/L-allo-threonine system were investigated by means of single-crystal X-ray diffraction and temperature-resolved X-ray powder diffraction. The L-threonine/L-allo-threonine system belongs to the systems with continuous solid solutions. The comparative analysis of crystal structures of L-threonine (L-Thr), L-allo-threonine (L-aThr), and their mixed crystals was conducted based on literature and our own data. It was found that the distances between methyl groups are more sensitive to the crystal composition than the lengths of the hydrogen bonds. Statistical distribution of L-Thr and L-aThr molecules causes the occurrence of shortened and elongated distances between the methyl groups of the neighbor nonidentical molecules (L-Thr-L-aThr). Thermal deformations of crystal structures of L-Thr, L-aThr, and solid solutions containing 34 and 90% L-Thr were investigated. In the case of diastereomers, the slight negative thermal expansion along the axis a was observed. Correlations between features of crystal structure and thermal behavior of L-Thr, L-aThr, and their solid solutions were identified.
机译：通过单晶X射线衍射和温度分辨X射线粉末衍射研究了L-苏氨酸/ L-苏氨酸-苏氨酸体系中的晶体结构特征及其热变形。 L-苏氨酸/ L-苏氨酸-苏氨酸系统属于具有连续固溶体的系统。基于文献和我们自己的数据，对L-苏氨酸（L-Thr），L-allo-苏氨酸（L-aThr）及其混合晶体的晶体结构进行了比较分析。已经发现，甲基之间的距离比氢键的长度对晶体组成更敏感。 L-Thr和L-aThr分子的统计分布会导致相邻异同分子（L-Thr-L-aThr）的甲基之间出现缩短和延长的距离。研究了L-Thr，L-aThr和包含34％和90％L-Thr的固溶体的晶体结构的热变形。在非对映异构体的情况下，沿轴a观察到轻微的负热膨胀。鉴定了晶体结构特征与L-Thr，L-aThr及其固溶体之间的相关性。

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