Abstract
Polycyclic aromatic hydrocarbons(PAHs)play an important role in the industry,and the development of new materials for the selective separation of PAHs is of great significance.In this work,we report a hex-ahedral metal-organic cage with low symmetry by subcomponent self-assembly.In this cage,the eight ZnⅡ centers adopt an interesting ∧∧/△△△△△△ or ∧∧∧∧∧∧/△△ configuration.This cage with a cav-ity volume of 520 Å3 can bind anthracene,phenanthrene,and pyrene to form 1:1 host-guest complexes,while the bigger triphenylene,chrysene,perylene,and coronene cannot be encapsulated.The binding constant Ka of pyrene is about 1.110 x 103(mol/L)-1,which is more than an order of magnitude larger than that of anthracene and phenanthrene(111(mol/L)-1,277(mol/L)-1,respectively).X-ray structure studies reveal that the pyrene is located in the cavity and stabilized by multiple C-H---π interactions.After separation from a mixture of PAHs,pyrene with＞96.1％purity can be obtained.This work provides a useful method for the first time for the selective separation of pyrene from PAHs mixture by utiliz-ing a metal-organic cage as the material,making it a useful tool for purifying and separating specific compounds from complex mixtures.
基金项目
国家自然科学基金(22171106)
国家自然科学基金(21731002)
国家自然科学基金(21975104)
国家自然科学基金(21871172)
国家自然科学基金(22201101)
Guangdong Major Project of Basic and Applied Research(2019B030302009)
广东省自然科学基金(2022A1515011937)
Guangzhou Science and Technology Program(202002030411)
中央高校基本科研业务费专项(21622103)
中国博士后科学基金(2022M711327)
Jinan University()
NETL
NSTL
维普
万方数据