Abstract：
Soft porous coordination polymers (PCPs) have the remarkable ability to recognize similar molecules as a result of their structural dynamics. However, their guest-induced gate-opening behaviors often lead to issues with selectivity and separation efficiency, as co-adsorption is nearly unavoidable. Herein, we report a strategy of a confined-rotational shutter, in which the rotation of pyridyl rings within the confined nanospace of a halogen-bonded coordination framework (NTU-88) creates a maximum aperture of 4.4 Å, which is very close to the molecular size of propyne (C3 H4 : 4.4 Å), but smaller than that of propylene (C3 H6 : 5.4 Å). This has been evidenced by crystallographic analyses and modelling calculations. The NTU-88o (open phase of activated NTU-88) demonstrates dedicated C3 H4 adsorption, and thereby leads to a sieving separation of C3 H4 /C3 H6 under ambient conditions. The integrated nature of high uptake ratio, considerable capacity, scalable synthesis, and good stability make NTU-88 a promising candidate for the feasible removal of C3 H4 from C3 H4 /C3 H6 mixtures. In principle, this strategy holds high potential for extension to soft families, making it a powerful tool for optimizing materials that can tackle challenging separations with no co-adsorption, while retaining the crucial aspect of high capacity.
摘要：
软多孔配位聚合物（PCPs）由于其结构动力学而具有识别相似分子的显着能力。然而,它们的客体诱导的闸门打开行为通常会导致选择性和分离效率的问题，因为共吸附几乎是不可避免的。在这里，我们报告了一种有限旋转快门的策略，其中吡啶基环在卤素键合配位框架（NTU-88）的有限纳米空间内的旋转产生4.4µ的最大孔径，非常接近丙炔的分子大小（C3H4：4.4µ），但小于丙烯（C3H6：5.4µ）。晶体学分析和建模计算证明了这一点。NTU-88o（活化NTU-88的开放阶段）展示了专门的C3H4吸附，从而在环境条件下导致C3H4/C3H6的筛分分离。高吸收比的综合性质，相当大的能力，可扩展合成，良好的稳定性使NTU-88成为从C3H4/C3H6混合物中可行去除C3H4的有希望的候选者。原则上,这种策略具有扩展到软家庭的巨大潜力，使其成为优化材料的强大工具，可以在没有共吸附的情况下解决具有挑战性的分离，同时保持高容量的关键方面。
