Construction of Multifunctional Covalent Organic Frameworks for Photocatalysis

Covalent organic frameworks (COFs) have recently drawn intense attention due to their potential applications in photocatalysis. Herein, we report a multifunctional COF which consists of triphenylamine (TPA) and 2,2’‐bipyridine (2, 2’‐bipy) entities. The obtained TAPA‐BPy‐COF is a heterogeneous photocatalyst and can efficiently catalyze the oxidative coupling of thiols to disulfides. In addition, TAPA‐BPy‐COF can be further metalated by Pd(II) via 2,2’‐bipy‐metal coordination. The generated Pd@TAPA‐BPy‐COF can highly promote photocatalytic synthesis of 3‐cyanopyridines via cascade addition/cyclization of arylboronic acids with γ‐ketodinitriles in heterogeneous way. This work has demonstrated the way for the rational design and preparation of more efficient photoactive COFs for photocatalysis.