Abstract In the solid state diallylamine forms supramolecular helices with four molecules per pitch that are held together by hydrogen bonding. The helical structure is the result of competing length scales at which hydrogen bonding and second-neighbour Van-der-Waals interactions occur. The structure features two crystallographically independent helices and four unique molecules in the asymmetric unit ( Z′ = 4). The high Z′ value is partly a consequence of the centrosymmetric pseudo-hexagonal packing of helical columns, which is incompatible with helical spacegroup symmetries. Graphic Abstract

中文翻译：

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固态二烯丙胺的螺旋结构

摘要 在固态二烯丙胺中形成超分子螺旋，每个螺距有四个分子，这些分子通过氢键结合在一起。螺旋结构是竞争长度尺度的结果，在该长度尺度上发生氢键和第二邻域范德瓦尔斯相互作用。该结构在不对称单元 (Z' = 4) 中具有两个晶体学独立的螺旋和四个独特的分子。高 Z' 值部分是螺旋柱的中心对称伪六边形堆积的结果，这与螺旋空间群对称性不相容。图形摘要