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首页> 外文期刊>Crystal growth & design >A search for predictable hydrogen-bonding synthons in cocrystallization of unusual organic acids with a bent dipyridine
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A search for predictable hydrogen-bonding synthons in cocrystallization of unusual organic acids with a bent dipyridine

机译:在不寻常的有机酸与弯曲的二吡啶共结晶中寻找可预测的氢键合成子

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摘要

A bent dipyridyl compound, 2,5-bis(4-pyridyl)-1,3,4-oxadiazole (4-bpo), was employed to crystallize with 1,4-cyclohexanedicarboxylic acid (H(2)chdc), hydroquinone, citric acid (H(4)ca center dot HO), barbituric acid, and ferrocene dicarboxylic acid (H(2)Fc) under general conditions, affording binary cocrystals [(H(2)chdc)center dot(4-bpo)] (1), [(hydrquinone)center dot(4-bPO)(2)] (2), [(H(4)ca)center dot(4-bpo)] ,(3), [(barbituric acid)center dot(4-bpo)] (4), and [(HFc)center dot(H-4-bpo)] (5) in high yield. X-ray single-crystal structures of these compounds 2 reveal that a supramolecular synthon [R-2(2)(7)] containing classical O-H center dot center dot center dot N and weak C-H center dot center dot center dot O interactions, usually observed in organic cocrystals of carboxylic acid and heterocyclic base, is again involved in constructing the hydrogen-bonding networks of 1, 3, and 5. Its ionic analogous synthon [consisting of strong N-H center dot center dot center dot O and weak C-H center dot center dot center dot O, R-2(2) (7)] also appears in the partly charge transfer salt 5. For 2, only hydroxyl of the hydroquinone component can act as the hydrogen-bonding contributor, giving a strong O-H center dot center dot center dot N bond with 4-bpo. Multiple hydrogen-bonded donating/accepting sites in compound 3 fulfill the formation of new Z, supramolecular patterns. For 4, another heterosynthon ring [containing strong N-H center dot center dot center dot N and weak C-H center dot center dot center dot O, R-2(2)(7)] is formed due to the presence of the imide functional group. As a consequence, robust hydrogen-bonding interactions in these compounds afford Z, diverse 2-D waved or planar layers (1 or 4), I-D extended tape (2), 3-D net (3), and I-D molecular-box type (5) supramolecular architectures. Thermal stability of these compounds has been investigated by thermogravimetric analysis (TGA) of mass loss.
机译:弯曲的二吡啶基化合物2,5-双(4-吡啶基)-1,3,4-恶二唑(4-bpo)用于与1,4-环己烷二甲酸(H(2)chdc),对苯二酚,柠檬酸(H(4)ca中心点HO),巴比妥酸和二茂铁二羧酸(H(2)Fc)在一般条件下提供二元共晶体[(H(2)chdc)中心点(4-bpo)] (1),[(对苯二酚)中心点(4-bPO)(2)](2),[(H(4)ca)中心点(4-bpo)],(3),[(巴比妥酸)中心点(4-bpo)](4)和[(HFc)中心点(H-4-bpo)](5)高产率。这些化合物2的X射线单晶结构表明,通常具有经典OH中心点中心点中心点N和弱CH中心点中心点中心点O相互作用的超分子合成子[R-2(2)(7)]在羧酸和杂环碱的有机共晶体中观察到,它又参与构建1、3和5的氢键网络。其离子类似合成子[由强NH中心点中心点中心点O和弱CH中心点组成中心点中心点O,R-2(2)(7)]也出现在部分电荷转移盐5中。对于2,只有对苯二酚成分的羟基可以作为氢键的贡献者,从而得到很强的OH中心点中心点中心点N键与4-bpo结合。化合物3中多个氢键键合的供体/接受位点完成了新的Z超分子图形的形成。对于4,由于存在酰亚胺官能团,形成了另一个杂合子环[包含强N-H中心点中心点中心点N和弱C-H中心点中心点中心R-2(2)(7)]。结果,这些化合物中强大的氢键相互作用提供Z,各种2D波动或平面层(1或4),ID延伸带(2),3-D网(3)和ID分子盒型(5)超分子结构。这些化合物的热稳定性已通过质量损失的热重分析(TGA)进行了研究。

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