Design of a Novel Naphtiridine-based Covalent Triazine Framework for Carbon Dioxide Capture and Storage Applications

Covalent triazine frameworks (CTFs) represent a sub-class of Porous Organic Polymers showing high chemical/thermal stability, large permanent porosity and intrinsically high N-content. All these features make them ideal candidates for Carbon Capture and Storage (CCS) applications. Herein, a novel CTF has been prepared under ionothermal conditions through cyclotrimerization of a newly designed dicyano-building block with high N/C ratio (2,6-Dicyano-1,5-naphthyridine, 4). The as prepared CTF-Napht showed remarkable carbon dioxide uptake at ambient conditions, with a loading of 3.93 mmol/g (17.3 wt. %) at 1 bar and 298 K that outperforms many benchmark CTF systems from the literature. The ad-hoc designed dicyano building unit together with a judicious choice of synthetic conditions have imparted to CTF-Napht an outstanding affinity towards CO2 confirmed by its isosteric heat of adsorption (Qst) as high as 39.6 KJ/mol that ranks among the highest reported so far for CTF-based polymers.