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Two-Dimensional Networks of Thiocyanuric Acid and Imine Bases Assisted by Weak Hydrogen Bonds

机译:硫氰酸和亚胺碱的二维网络通过弱氢键辅助

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摘要

Co-crystals of thiocyanuric acid (TCA) and five multitopic bases are reported, and their structures are compared. The adducts of all five co-crystals form two-dimensional hydrogen-bonded sheets that are either stacked or interpenetrated. Strong N-H center dot center dot center dot N hydrogen bonds between TCA and the N-heterocyclic bases are supplemented by pairs of longer, weaker C-H center dot center dot center dot S hydrogen bonds resulting in a motif reminiscent of the complementary triple hydrogen bond observed between imides and aminopyridines. TCA is observed to fulfill different roles in the adducts: a 3-fold node with triazine, a dimer junction exhibiting 4-fold connectivity with pyrazine, 2,7-diazapyrene, and DABCO, and an extended ribbon with 1,2-di(4-pyridyl)ethylene. The weak C-H center dot center dot center dot S hydrogen bonds are seen to be readily distorted to accommodate favorable packing arrangements in the adducts with pyrazine and DABCO, suggesting these weak C-H center dot center dot center dot S interactions possess a limited role in the direction of topology.
机译:报道了硫氰酸(TCA)和五个多型碱基的共晶,并比较了它们的结构。所有五个共晶体的加合物形成堆叠或渗透的二维氢键片。 TCA和N-杂碱基之间的强NH中心点中心点中心点N氢键由对较较长的CH中心点中心点中心点S氢键来补充,导致MOTIF联想到所观察到的互补三氢键酰胺和氨基吡啶。观察到TCA以满足加合物中的不同作用:三倍的节点,三嗪,二聚体结,其与吡嗪,2,7-二氮烷烃和Dabco连接4倍连接,以及带1,2-DI的延伸带的延伸带4-吡啶基)乙烯。弱CH中心点中心点中心点氢键被视为容易扭曲,以适应吡嗪和DABCO的加合物中的有利包装布置,表明这些弱CH中心点中心点中心点的相互作用在方向上具有有限的作用拓扑。

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