首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >Crystal structures of three di-and tetrabenzylterephthalamides
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Crystal structures of three di-and tetrabenzylterephthalamides

机译:三种对苯二甲酸和四苄基对苯二甲酰胺的晶体结构

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The X-ray crystal structures of the three compounds N,N′- dibenzylterephthalamide, 1, N,N′-dibenzyl- N,N′- dimethylterephthalamide, 2, and N,N,N′,N′- tetrabenzylterephthalamide, 3, were determined. Compound 1 fits into the general pattern of disubstituted terephthalamides, with crystallographic inversion symmetry and classical hydrogen bonds linking the molecules into chains parallel to the short axis. Compound 2 also displays inversion symmetry, but the packing only involves two weak hydrogen bonds of the form C-H_(methyl) ?O. The complex packing of compound 3, which possesses no crystallographic symmetry, involves only two C-H?O contacts; these are augmented by three C-H?π interactions.
机译:三种化合物N,N'-二苄基对苯二甲酰胺,1,N,N'-二苄基-N,N'-二甲基对苯二甲酰胺2,和N,N,N',N'-四苄基对苯二甲酰胺3的X射线晶体结构,被确定。化合物1符合二取代对苯二甲酰胺的一般模式,具有晶体学上的反转对称性和经典的氢键,将分子连接成与短轴平行的链。化合物2也表现出反转对称性,但是填充仅包含两个C-H_(甲基)δO形式的弱氢键。没有结晶对称性的化合物3的复杂堆积,仅涉及两个C-H2O接触。这些通过三个C-H?π相互作用而增强。

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