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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Persistent hydrogen bonding in polymorphic crystal structures
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Persistent hydrogen bonding in polymorphic crystal structures

机译:多态晶体结构中的持久氢键

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The significance of hydrogen bonding and its variability in polymorphic crystal structures is explored using new automated structural analysis methods. The concept of a chemically equivalent hydrogen bond is defined, which may be identified in pairs of structures, revealing those types of bonds that may persist, or not, in moving from one polymorphic form to another. Their frequency and nature are investigated in 882 polymorphic structures from the Cambridge Structural Database. A new method to compare conformations of equivalent molecules is introduced and applied to derive distinct subsets of conformational and packing polymorphs. The roles of chemical functionality and hydrogen-bond geometry in persistent interactions are systematically explored. Detailed structural comparisons reveal a large majority of persistent hydrogen bonds that are energetically crucial to structural stability.
机译:使用新的自动结构分析方法,探索了氢键的重要性及其在多态晶体结构中的可变性。定义了化学等价氢键的概念,该概念可以成对结构识别,揭示了在从一种多晶型形式转变为另一种多晶型形式时可以持久或不持久的那些键类型。在剑桥结构数据库的882个多态结构中研究了它们的频率和性质。介绍了一种比较等效分子构象的新方法,并将其应用于衍生构象和堆积多晶型物的不同子集。系统地探讨了化学官能度和氢键几何结构在持久相互作用中的作用。详细的结构比较显示,绝大多数持久性氢键对结构稳定性在能量上至关重要。

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