Wu Wufeng, Su Jingyi, Jia Miaomiao, Li Zhanjun, Liu Guoqiang, Li Wanbin
Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 511443, China.
Sci Adv. 2020 May 1;6(18):eaax7270. doi: 10.1126/sciadv.aax7270. eCollection 2020 May.
Metal-organic frameworks (MOFs) have been attracting intensive attention because of their commendable potential in many applications. Postsynthetic modification for redesigning chemical characteristics and pore structures can greatly improve performance and expand functionality of MOF materials. Here, we develop a versatile vapor-phase linker exchange (VPLE) methodology for MOF modification. Through solvent-free and environment-friendly VPLE processing, various linker analogs with functional groups but not for straightforward MOF crystallization are inserted into frameworks as daughter building blocks. Besides single exchange for preparing MOFs with dual linkers, VPLE can further be performed by multistage operations to obtain MOF materials with multiple linkers and functional groups. The halogen-incorporated ZIFs exhibit good porosity, tunable molecular affinity, and impressive CO/N and CH/N adsorption selectivities up to 31.1 and 10.8, respectively, which are two to six times higher than those of conventional adsorbents. Moreover, VPLE can substantially enhance the compatibility of MOFs and polymers.
金属有机框架材料（MOFs）因其在许多应用中具有可观的潜力而备受关注。通过后合成修饰来重新设计化学特性和孔结构，可以极大地提高MOF材料的性能并扩展其功能。在此，我们开发了一种用于MOF修饰的通用气相连接体交换（VPLE）方法。通过无溶剂且环境友好的VPLE处理，各种带有官能团但不能直接用于MOF结晶的连接体类似物作为子结构单元插入到框架中。除了用于制备具有双连接体的MOFs的单交换外，VPLE还可以通过多步操作进一步进行，以获得具有多个连接体和官能团的MOF材料。含卤素的沸石咪唑酯骨架材料（ZIFs）表现出良好的孔隙率、可调的分子亲和力，以及令人印象深刻的CO/N和CH/N吸附选择性，分别高达31.1和10.8，这比传统吸附剂高出两到六倍。此外，VPLE可以显著提高MOFs与聚合物的相容性。
