Synthesis, Characterization, and Application of MOF/COF Hybrid Composite as a Highly Active and Recyclable Catalyst for Multicomponent Synthesis of Chromeno[4,3‐<i>b</i>]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 NH 2 ‐Glu‐MOF/MT‐COF nanocomposite using the integration of glutamate MOF (NH 2 ‐Glu‐MOF) and melamine‐terephthaldehyde COF (MT‐COF) via imine bond connection. The synthesized NH 2 ‐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 NH 2 ‐Glu‐MOF/MT‐COF nanocomposite has ideal structural and compositional properties such as good specific surface area (241.631 m 2 g −1 ), high pore volume, and high thermal stability (530°C). Because of such unbeatable structural and compositional features, NH 2 ‐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 (NH 2 ‐Glu‐MOF or MT‐COF). Additionally, NH 2 ‐Glu‐MOF/MT‐COF nanocomposite demonstrated supreme recyclability during five catalytic cycles.