Zhu Weijie, Li Errui, Huang Feihe
State Key Laboratory of Chemical Engineering, Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China.
Green Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou 450001, P. R. China.
ACS Appl Mater Interfaces. 2021 Feb 17;13(6):7370-7376. doi: 10.1021/acsami.0c23059. Epub 2021 Feb 5.
Isopropylbenzene () and α-methylstyrene (), two members of C9 aromatics, are important in both industrial production and laboratory research, but the separation of / mixtures is still a big challenge. Here, we provide a new strategy to separate and using nonporous adaptive crystals of four pillararenes, perethylated pillar[5]arene, perethylated pillar[6]arene, perbromoethylated pillar[5]arene, and perbromoethylated pillar[6]arene (). Among them, selectively adsorbs from an equal volume mixture of and with >95% purity for solid-vapor phase adsorption and >94% purity for solid-liquid phase adsorption, while the selectivities for the other three pillararenes are unsatisfactory. Single-crystal structural analyses combined with powder X-ray diffraction and differential scanning calorimetry experiments demonstrate that the selectivity arises from the different stabilities of guest-loaded crystals. Moreover, the reversible transitions between guest-free and -loaded structures indicate the preeminent recycling performance of crystals.
异丙苯（ ）和α-甲基苯乙烯（ ）是C9芳烃的两个成员，在工业生产和实验室研究中都很重要，但 / 混合物的分离仍然是一个巨大的挑战。在此，我们提供了一种新策略，使用四种柱芳烃的无孔自适应晶体，即全乙基化柱[5]芳烃、全乙基化柱[6]芳烃、全溴乙基化柱[5]芳烃和全溴乙基化柱[6]芳烃（ ）来分离 和 。其中， 从 和 的等体积混合物中选择性吸附 ，对于固-气相吸附，纯度>95%，对于固-液相吸附，纯度>94%，而其他三种柱芳烃的选择性则不尽人意。单晶结构分析结合粉末X射线衍射和差示扫描量热实验表明，选择性源于客体负载 晶体的不同稳定性。此外，无客体和负载客体结构之间的可逆转变表明 晶体具有卓越的循环性能。
