Abstract:Porous organic polymer (POP) has attracted great interests due to its excellent pore tunability and diverse synthetic methods, and has been widely used in the fields of gas storage, carbon capture, separation, catalysis, sensing, energy storage and conversion. However, most of the POP are prepared from expensive monomers and noble metal catalysts which usually require complicated workup thus rise the cost and reduce the synthetic efficiency. It is necessary to explore some novel precious-metal-free and workup-easy polymerization reactions to efficiently obtain POP. In this work, the monomer 1,2-bis(3,4-dichloromaleimidyl)-hex- ane was firstly synthesized from the reaction of 1,2-diaminocyclohexane and dichloromaleic anhydride. The porous organic polymer was further synthesized through nucleophilic substitution polymerization between 1,2-bis(3,4-dichloromaleimidyl)-hexane and 1,3,5-tris-(4-aminophenyl) with acetic acid as solvent. Fourier transform infrared spectroscopy (FT-IR) indicated the C-N formation between dichloromale imide and aromatic amine units. Nitrogen adsorption–desorption isotherm showed that the prepared POP has a high BET surface area (404 m2/g) and a wide range of pore size distribution from 1 to 6 nm (containing micropore and mesopore). In addition, scanning electron microscopy (SEM) showed that the prepared polymer has regular rod structure (diameter, 1-5 μm). The thermogravimetric analysis (TG) revealed the POP has excellent thermal stability (degration temperature up to 400 oC). As a novel catalyst-free and workup-easy C-N coupling reaction, the developed nucleophilic substitution polymerization between dichloromale imide and aromatic amine works well to efficiently synthesize maleic amide-based POP, and it is an eco-friendly C-N crossing strategy which can provide people another choice to efficiently obtain the targeted POP free of catalysts.