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首页> 外文期刊>Crystal growth & design >Structural Studies of Enantiomers, Racemates, and Quasiracemates. N-(2-Chlorobenzoyl)methylbenzylamine and N-(2-Bromobenzoyl)methylbenzylamine
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Structural Studies of Enantiomers, Racemates, and Quasiracemates. N-(2-Chlorobenzoyl)methylbenzylamine and N-(2-Bromobenzoyl)methylbenzylamine

机译:对映异构体,外消旋体和准外消旋体的结构研究。 N-(2-氯苯甲酰基)甲基苄胺和N-(2-溴苯甲酰基)甲基苄胺

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摘要

Recrystallization of equimolar quantities of (R)-N-(2-chlorobenzoyl)methylbenzylamine (1) and (S)-N-(2-bromobenzoyl)methylbenzylamine (2) forms quasiracemic crystals (3) with approximately centrosymmetric molecular frameworks. The molecular recognition behavior observed for the principal quasiracemate diarylamide components follows a best-fit scenario controlled by topological influences. The relation of molecular shape to crystalline architectures is supported by a systematic structural study of the complete family of quasiracemate, racemeate, and enantiomer structure,s including two polymorphic forms of enantiomeric 1. Each of the enantiomeric, racemic, and quasiracemic compounds crystallizes to form molecular scaffolds linked by C(4)N-H…O interactions. Although this typical hydrogen bond motif of the trans amide moiety provides a common structural theme for these diarylamides, significant variations in crystal packing arise due to the orientation of molecules within the catemeric hydrogen bond motif and the alignment of neighboring C(4) chains.
机译:等摩尔量的(R)-N-(2-氯苯甲酰基)甲基苄胺(1)和(S)-N-(2-溴苯甲酰基)甲基苄胺(2)的重结晶形成具有近似中心对称分子骨架的准外消旋晶体(3)。观察到的主要准氨基甲酸酯二芳基酰胺组分的分子识别行为遵循受拓扑影响控制的最佳拟合方案。分子形状与晶体结构的关系得到了对准racemate,消旋酸酯和对映异构体结构的完整家族的系统结构研究的支持,其中包括两种对映异构体1的多晶型形式。每种对映异构体,消旋体和准外消旋化合物都结晶形成通过C(4)NH…O相互作用链接的分子支架。尽管反式酰胺部分的这种典型氢键基序为这些二芳基酰胺提供了共同的结构主题,但由于分子在链状氢键基序内的取向和相邻C(4)链的排列,在晶体堆积中产生了显着变化。

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