Synthesis, Characterization, and Application of MOF/COF Hybrid Composite as a Highly Active and Recyclable Catalyst for Multicomponent Synthesis of Chromeno[4,3-b]quinoline-6-ones

Abstract

The conjugation of metal–organic frameworks (MOFs) with covalent organic frameworks (COF), as a catalytically active nanocomposite with integrated properties, is a smart strategy for developing efficient catalytic systems. Herein, we report the design and synthesis of NH₂-Glu-MOF/MT-COF nanocomposite using the integration of glutamate MOF (NH₂-Glu-MOF) and melamine-terephthaldehyde COF (MT-COF) via imine bond connection. The synthesized NH₂-Glu-MOF/MT-COF nanocomposite has been fully characterized using FT-IR, XRD, BET, TEM, FE-SEM, EDX, EDX mapping, TGA, and ICP-OES techniques. Analyses demonstrate that NH₂-Glu-MOF/MT-COF nanocomposite has ideal structural and compositional properties such as good specific surface area (241.631 m² g⁻¹), high pore volume, and high thermal stability (530°C). Because of such unbeatable structural and compositional features, NH₂-Glu-MOF/MT-COF nanocomposite shows much better catalytic activity for the synthesis of a wide library chromeno[4,3-b]quinoline-6-one derivatives than parent materials (NH₂-Glu-MOF or MT-COF). Additionally, NH₂-Glu-MOF/MT-COF nanocomposite demonstrated supreme recyclability during five catalytic cycles.