ABSTRACT Supported noble metal nanoparticles represent a class of highly efficient and stable heterogeneous catalysts. In this work, a series of porous aromatic frameworks (PAFs) were subsequently synthesized using diphosphine monomers, which offer abundant coordination sites and favorable electronic effects. The resulted BPAF‐160 to ‐163 possess high surface areas and outstanding stability, making them highly suitable as platforms for gold nanoparticles (AuNPs) immobilization. The coordinative environments in these BPAFs were tailored by varying the carbon spacers between dual‐P centers, and the resultant Au‐BPAF‐160 to ‐163 all exhibit excellent catalytic activity and recyclability in the reduction of different substituted nitroarenes. Notably, Au‐BPAF‐160 and ‐162 show the faster kinetic rates ( k ) for the reduction of 4‐nitrophenol (4‐NP) because the lone pairs of dual‐P atoms with odd‐numbered carbon spacers optimized the charge distributions of metal centers and induced highly dispersed AuNPs with smaller sizes. This work will provide a guide for the construction of stable metal nano‐catalytsts based on porous materials.
Yang et al. (Sun,) studied this question.