Green and rapid synthesis of a two-dimensional Zn-MOF with Lewis acid–base sites via a solvent-free strategy

Abstract

For the first time, a two-dimensional Zn-MOF featuring cooperative Lewis acid–base dual-functional sites was synthesized via a green and efficient solvent-free strategy. Ultrafast crystallization on the order of minutes was achieved, generating nanocrystals with high crystallinity and deviated facet orientation. The exposure of nitrogen sites was thereby stimulated, profoundly elevating the Lewis basicity of the solvent-free sample. The acidic zinc nodes and basic nitrogen sites of this sample synergistically boosted its performances in CO₂ cycloaddition reactions and flame retardancy applications, outperforming its water-synthesized counterpart and numerous other MOFs. These findings unambiguously disclose the advantages of the solvent-free strategy in the synthesis and utilization of MOFs.