浙江大学杨启炜团队设计非芳香族金属-有机框架高效分离C8芳香族异构体。相关研究成果发表在2022年11月10日出版的国际学术期刊《美国化学会杂志》。

C8芳烃（二甲苯和乙苯）的分离由于其相似的结构和性质，仍然是最具挑战性的工业分离之一。迫切需要能够区分异构体之间微小差异的合适吸附剂。

该文中，研究人员展示了一种通过构建具有混合多环烷烃型配体的、非芳烃封闭孔环境来实现C8芳烃精确鉴别的策略。非芳族低极性孔环境避免了框架和常见苯环之间的强收敛相互作用，同时创造了增大关于异构体不同甲基（乙基）位置的主-客/客-客相互作用之间差异的可能性。

合成的金属-有机框架ZUL-C3具有四方或单斜晶格，对C8芳烃具有优异的分离性能，不仅实现了四种异构体的同时分离，而且为OX/PX和OX/MX的动态分离性能树立了基准。

附：英文原文

Title: Highly Efficient Separation of C8 Aromatic Isomers by Rationally Designed Nonaromatic Metal–Organic Frameworks

Author: Jingyi Zhou, Tian Ke, Yifei Song, Hongyi Cai, Zhuo’an Wang, Luyao Chen, Qianqian Xu, Zhiguo Zhang, Zongbi Bao, Qilong Ren, Qiwei Yang

Issue&Volume: November 10, 2022

Abstract: The separation of C8 aromatics (xylenes and ethylbenzene) remains one of the most challenging industrial separations due to their similar structures and properties. Suitable adsorbents that can distinguish the small differences among isomers are urgently demanded. Herein, we demonstrate a strategy to realize the precise discrimination of C8 aromatics by constructing a nonaromatic confined pore environment with mixed polycycloalkane-type ligands. The nonaromatic low-polar pore environment avoids strong convergent interactions between the framework and the common phenyl rings while creating possibilities to amplify the difference between host–guest/guest–guest interactions regarding the different methyl (ethyl) group positions of isomers. The resultant metal–organic framework, ZUL-C3, with either tetragonal or monoclinic lattice, exhibits outstanding separation performance for C8 aromatics, not only realizing the simultaneous separation of four isomers from each other but also setting a benchmark for the dynamic separation performance of OX/PX and OX/MX.

DOI: 10.1021/jacs.2c10595

Source: https://pubs.acs.org/doi/10.1021/jacs.2c10595