Exploration synthesis and study of indol and pyridine based heterocycle porous organic polytriazine for highly efficient iodine capture

Over the past few decades, porous organic polymers (POPs) materials have exhibited great application potential in volatile radioactive iodine capture field for their porosity structures and feasible functional networks. However, the iodine adsorption capacities of POPs are still needed to improve through efficient molecule structure design strategy. Herein, we report a novel nitrogen-rich porous organic polytrazine (HCPOT-In) containing pyridine and indole units was designed and synthesized by a simple one-step Lewis acid-catalyzed Friedel-Crafts reaction of 2,6-di(1H-indol-1-yl)pyridine and 2,4,6-trichloro-1,3,5-triazine. The derived HCPOT-In showed permanent porosity and good stability. Taking advantages of the strong host-guest interaction from the porosity structure, nitrogen-rich skeleton and pi-conjugated network, HCPOT-In showed the excellent volatile iodine adsorption capacity up to 4.08 g g(-1) (348 K, 1 bar) with high amount of per unit S-BET (14.6 wt%) and also great carbon dioxide capture performance of 120 cm(3) g(-1) (1 bar, 273 K). We hope this report will provide a molecular structure design idea in constructing novel POPs as efficient adsorbent materials applying in environment protection field.

Automated summary

Porous organic polymers (POPs) have shown great potential in the field of volatile radioactive iodine capture due to their porous structures and feasible functional networks. However, the iodine adsorption capacities of POPs still need to be improved through efficient molecule structure design strategy. In this study, a nitrogen-rich porous organic polytrazine (HCPOT-In) was designed and synthesized by a simple one-step Lewis acid-catalyzed reaction. The HCPOT-In exhibited permanent porosity and good stability. With the advantages of its porosity structure, nitrogen-rich skeleton, and pi-conjugated network, HCPOT-In showed excellent volatile iodine adsorption capacity and carbon dioxide capture performance.