Template-Free Synthesis of Hierarchical Porous Metal–Organic\nFrameworks

Abstract

A template-free\nsynthesis of a hierarchical microporous–mesoporous\nmetal–organic framework (MOF) of zinc­(II) 2,5-dihydroxy-1,4-benzenedicarboxylate\n(Zn-MOF-74) is reported. The surface morphology and porosity of the\nbimodal materials can be modified by etching the pore walls with various\nsynthesis solvents for different reaction times. This template-free\nstrategy enables the preparation of stable frameworks with mesopores\nexceeding 15 nm, which was previously unattained in the synthesis\nof MOFs by the ligand-extension method.