Ternary and quaternary co-crystals of 1,3-cis,5-cis-cyclohexanetricarboxylic acid and 4,4′-bipyridines
作者:Balakrishna R. Bhogala、Ashwini Nangia
DOI:10.1039/b800293b
日期:——
1,3cis,5cis-Cyclohexanetricarboxylic acid (H3CTA) was co-crystallized with 4,4â²-bipyridine bases connected viamethylene and alkene chains to obtain ternary acidâbase co-crystals, H3CTA·bipy1·bipy2. The hydrogen bond network and mode of interpenetration in co-crystal structures are discussed in relation to known (6,3) nets. The rectangular host container of composition H3CTA·bipy-eta·(bipy-bu)0.5 includes a variety of aromatic guest species in its 10 à 12 Ã
channels. The ternary and quaternary co-crystals are characterized by X-ray diffraction to analyze the hydrogen bonding and molecular packing. Whereas the acidâpyridine OâHâ¯N hydrogen bond sustains reliable supramolecular aggregation in multi-component crystal structures, the change of bipyridine base connector imparts structural diversity in these supramolecular structures. A self-assembly model based on helix and chain sub-units of acid·bipy1 being connected via the bipy2 spacer to give hexagonal and square network structures is proposed.
1,3顺式,5顺式-环己三羧酸(H3CTA)与通过亚甲基和烯烃链连接的4,4′-联吡啶碱基共结晶,得到了三元酸–碱共晶H3CTA·bipy1·bipy2。本文讨论了共晶结构中的氢键网络和交错模式与已知的(6,3)网格的关系。组成式的矩形容器H3CTA·bipy-η·(bipy-bu)0.5,其10×12 Å的通道中包含各种芳香族客体物种。三元和四元共晶通过X射线衍射法表征,以分析氢键和分子堆积。尽管酸–吡啶O–H…N氢键在多组分晶体结构中保持可靠的超分子聚集,但联吡啶碱基连接体的变化赋予了这些超分子结构结构多样性。提出了一个基于酸·bipy1的螺旋和链亚单元通过bipy2间隔体连接形成六角形和方形网络结构的自组装模型。