?-? stacking interactions: Non-negligible forces for stabilizing porous supramolecular frameworks.

ABSTRACT: Revealing the contribution of ?-? stacking interactions in supramolecular assembly is important for understanding the intrinsic nature of molecular assembly fundamentally. However, because they are much weaker than covalent bonds, ?-? stacking interactions are usually ignored in the construction of porous materials. Obtaining stable porous materials that are only dependent on ?-? stacking interactions, despite being very challenging, could address this concern. Here, we present a porous supramolecular framework (?-1) stabilized only by intermolecular ?-? stacking interactions. ?-1 shows good thermal and chemical stability not only in various organic solvents but also in aqueous solution in a broad pH range. Furthermore, featuring one-dimensional channels with dangling thiolate groups, ?-1 exhibits excellent Hg2+ removal performance, with adsorption capacity as high as 786.67 mg g-1 and an adsorption ratio as high as 99.998%. In addition, ?-1 also shows high adsorption selectivity to Hg2+ in the presence of a series of interfering ions.

SUBMITTER: Deng JH 

PROVIDER: S-EPMC6954060 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature