Novel CO2-philic porous organic polymers synthesized in water: a leap towards eco-sustainability†

We introduce two novel keto-enamine-linked porous organic polymers (POPs) distinguished by the presence of methyl or ethyl groups in their triamine precursors. These innovative POPs can be synthesized efficiently in water under mild conditions, utilizing starting materials that can be prepared on a gram scale through well-established procedures. Unlike most CO₂-philic POPs, which often require organic solvents, high temperatures, catalysts, additives, or hydrothermal equipment, these new polymers are synthesized in pure water at a relatively low temperature (70 °C) without any catalysts or additives and using common glassware. The N-rich composition of these porous organic polymers also contributes to their high adsorption selectivity for CO₂ over N₂, as calculated with the IAST method at 298 K. This combination of environmentally friendly synthesis, high yield, and superior adsorption properties positions these novel POPs as promising candidates for greener carbon capture technologies based on solid sorbents.