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首页> 外文期刊>Crystal growth & design >Identical molecular strings woven differently by intermolecular interactions in dimorphs of myo-inositol 1,3,5-orthobenzoate
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Identical molecular strings woven differently by intermolecular interactions in dimorphs of myo-inositol 1,3,5-orthobenzoate

机译:通过分子间相互作用在肌醇1,3,5-原苯甲酸酯的双晶型中编织的相同分子串

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摘要

myo-Inositol 1,3,5-orthobenzoate exhibits polymorphic behavior depending upon the solvent and time allowed for crystallization. Long plates (form I, monoclinic P2(1)) are produced on crystallization from methanol, while crystallization from ethyl acetate mostly yielded squarish plates (form II, monoclinic P2(1)/c). The latter could also be obtained by achieving rapid nucleation from a supersaturated solution of methanol. Remarkably, the overall conformation of the individual molecules is very similar in both polymorphs, although free rotations were possible for the phenyl ring and for the three O-H groups. O-H center dot center dot center dot O linked one-dimensional isostructural molecular strings in the two forms weave differently by weak intermolecular interactions to produce the dimorphs. Striking difference is seen in the "zipping" of molecular layers via phenyl center dot center dot center dot phenyl contacts; thermodynamic crystals of form I utilize a well-recognized "edge-to-face" herringbone pattern, making C-H center dot center dot center dot pi interactions, whereas the kinetic crystals of form II show rather uncommon "edge-to-edge" organization, which makes short Ph-H center dot center dot center dot H-Ph contacts.
机译:1,3,5-原苯甲酸肌醇显示出多晶型行为,具体取决于溶剂和结晶时间。长板(形式I,单斜晶系P2(1)/ c)是在甲醇中结晶生成的,而从乙酸乙酯中结晶则主要产生方板(形式II,单斜晶系P2(1)/ c)。后者也可以通过从甲醇的过饱和溶液中快速成核而获得。值得注意的是,尽管对于苯环和三个O-H基团而言,自由旋转都是可能的,但两种多晶型物中单个分子的总体构象都非常相似。 O-H中心点中心点中心点O链接的两种形式的一维同构分子串通过微弱的分子间相互作用而不同地编织,从而产生双晶型。在通过苯基中心点中心点中心点苯基接触而在分子层的“压缩”中看到了惊人的差异。形式I的热力学晶体利用公认的“边对面”人字形图案,使CH中心点中心点中心点pi相互作用,而形式II的动力学晶体表现出相当罕见的“边对边”组织,这使得短的Ph-H中心点中心点中心点H-Ph接触。

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