Complex Polymorphic System of Gallic Acid-Five Monohydrates, Three Anhydrates, and over 20 Solvates.

Complex Polymorphic System of Gallic Acid-Five Monohydrates, Three Anhydrates, and over 20 Solvates.
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DOI:
10.1021/cg301506x
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发表时间:
2013-01-02
影响因子:
3.8
通讯作者:
Price SL
Price SL
中科院分区:
化学2区
文献类型:
--
作者:
Braun DE;Bhardwaj RM;Florence AJ;Tocher DA;Price SL

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我们报告了没食子酸和两个额外的无水多晶型物的第五水合物的结构和形成的至少22种其他溶剂化物的证据,许多含有水和另一种溶剂。这种前所未有的一水合物多晶型物数量和固体形式的多样性与无水物和一水合物晶体能量景观一致,显示了广泛的包装图案和一些仅在质子位置上不同的结构。通过帮助粉末X射线衍射数据的结构解决方案和指导筛选,计算研究有助于解释没食子酸的复杂多态性。这是工业上相关的,因为三种无水物在环境条件下是稳定的,但水合/脱水行为非常依赖于相对湿度和相纯度。一个广泛的固体形式的实验屏幕,由计算生成的无水物和一水合物晶体能量景观驱动,揭示了第五个(!)没食子酸的一水合物结构、两种另外的无水多晶型物的结构以及至少22种溶剂化物的证据。计算研究与其他分析技术相结合的应用有助于解开复杂的多晶型系统的没食子酸。
We report the structure of the fifth monohydrate of gallic acid and two additional anhydrate polymorphs and evidence of at least 22 other solvates formed, many containing water and another solvent. This unprecedented number of monohydrate polymorphs and diversity of solid forms is consistent with the anhydrate and monohydrate crystal energy landscapes, showing both a wide range of packing motifs and also some structures differing only in proton positions. By aiding the solution of structures from powder X-ray diffraction data and guiding the screening, the computational studies help explain the complex polymorphism of gallic acid. This is industrially relevant, as the three anhydrates are stable at ambient conditions but hydration/dehydration behavior is very dependent on relative humidity and phase purity. An extensive experimental screen for solid forms, driven by computationally generated anhydrate and monohydrate crystal energy landscapes, revealed the fifth (!) monohydrate structure of gallic acid, structures of two additional anhydrate polymorphs, and evidence of at least 22 solvates. The application of computational studies in combination with other analytical techniques helps unravel the complex polymorphic system of gallic acid.
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期刊: Acta crystallographica. Section B, Structural science
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