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首页> 外文期刊>Crystallography reports >General Structural Features of Centric and Acentric Polymorphic Pairs of Organic Molecular Crystals: II. Polymorphic Pairs P2_1/c-P2_1, P2_1/c-Pc, and P2_1/c-Pna2_1
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General Structural Features of Centric and Acentric Polymorphic Pairs of Organic Molecular Crystals: II. Polymorphic Pairs P2_1/c-P2_1, P2_1/c-Pc, and P2_1/c-Pna2_1

机译:有机分子晶体的中心和中心多态对的一般结构特征:II。多态对P2_1 / c-P2_1,P2_1 / c-Pc和P2_1 / c-Pna2_1

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摘要

A systematic investigation into the general structural features of centric and acentric polymorphic pairs of organic molecular crystals is performed using the data available in the Cambridge Structural Database. The structural aspects of the P2_1/c-P2_1, P2_1/c-Pc, and P2_1/c-Pna2_1 polymorphic pairs are considered. The most important inferences made in this study are as follows: (i) the centric and acentric modifications rather frequently (~50% of all the cases) crystallize simultaneously under the same conditions (concomitant polymorphism); (ii) the unit cell parameters of these modifications are found to be either close in magnitude or multiples; (iii) in the centric and acentric modifications, identical or very similar types of chiral or acentric stable molecular associates are formed through hydrogen bonds or other specific intermolecular interactions; and (iv) the centric and acentric modifications more often than other compounds are characterized by polysystem unit cells (Z' > 1).
机译:使用剑桥结构数据库中的数据,对有机分子晶体的中心和非中心多态对的一般结构特征进行了系统研究。考虑了P2_1 / c-P2_1,P2_1 / c-Pc和P2_1 / c-Pna2_1多态对的结构方面。在这项研究中,最重要的推论如下:(i)在相同条件下(伴随多态性),中心和非中心修饰相当频繁地(占所有情况的50%)同时结晶。 (ii)发现这些修饰的晶胞参数在大小上接近或倍数; (iii)在中心和非中心修饰中,通过氢键或其他特定的分子间相互作用形成相同或非常相似的手性或非中心稳定分子缔合体; (iv)中心修饰和非中心修饰比其他化合物更常见的特征是多系统晶胞(Z'> 1)。

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