Jiang Yao, Tan Peng, Qi Shi-Chao, Liu Xiao-Qin, Yan Jia-Hui, Fan Fan, Sun Lin-Bing
State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), College of Chemical Engineering, Nanjing Tech University, Nanjing, 211816, China.
Angew Chem Int Ed Engl. 2019 May 13;58(20):6600-6604. doi: 10.1002/anie.201900141. Epub 2019 Feb 21.
Photoresponsive metal-organic frameworks (PMOFs) are of interest for tailorable CO adsorption. However, modulation of CO adsorption on PMOFs is based on steric hindrance or structural change owing to weak interactions between CO and active sites. It is challenging to fabricate PMOFs with strong but tailorable sites for CO adsorption. Now, the construction of PMOFs with target-specific (strong) active sites is achieved by introducing tetraethylenepentamine into azobenzene-functionalized MOFs for tailorable CO adsorption. Amines are specific active sites for CO , contributing to capture CO selectively. Cis/trans isomerization of azobenzene motifs trigged by UV/Vis light adjusts the electrostatic potential of amines significantly, leading to exposure/shelter of amines and modulation of CO adsorption on strong active sites. This system enables us to design adsorption processes for CO capture from mixtures, which is impossible to realize by traditional PMOFs.
光响应金属有机框架（PMOFs）因其可定制的CO吸附性能而备受关注。然而，由于CO与活性位点之间的相互作用较弱，PMOFs上CO吸附的调节基于空间位阻或结构变化。制备具有强且可定制的CO吸附位点的PMOFs具有挑战性。现在，通过将四乙烯五胺引入偶氮苯功能化的MOFs中以实现可定制的CO吸附，从而构建具有目标特异性（强）活性位点的PMOFs。胺是CO的特异性活性位点，有助于选择性捕获CO。紫外/可见光引发的偶氮苯基团的顺/反异构化显著调节了胺的静电势，导致胺的暴露/遮蔽以及强活性位点上CO吸附的调节。该系统使我们能够设计从混合物中捕获CO的吸附过程，这是传统PMOFs无法实现的。
