Improved performance of the pyrimidine-modified porous In-MOF and an in situ prepared composite Ag@In-MOF material

Abstract

A stable porous In-MOF 1 was prepared for the first time via an asymmetric N,O-containing (2-pyrimidin-5-yl)terephthalic acid (H₂L). It was found that the 1,4-benzenedicarboxylate anions (bdc²⁻) were formed in the synthesis process of 1. Thus, another new isomorphic In-MOF 2 was formed by employing the H₂bdc ligand in the synthesis process of 1. More importantly, when adding AgNO₃ in the synthesis process of 1 and 2, only composite Ag@1 was obtained via the in situ reduction of Ag(I) to Ag NPs without additional reducing agent. MOF 1 and Ag@1 had great sorption capacity; in particular, 1 had remarkable dynamic selectivity for C₂H₂/CH₄ and CO₂/CH₄, and they were also efficient catalysts for fixing CO₂ and epoxides. It is hoped that this work may supply an effective strategy to build stable MOFs and composite Ag@MOF materials with excellent multifunctional applications.