BODIPY-containing porous organic polymers for gas adsorption

Abstract

A series of BODIPY-containing microporous organic polymers was synthesized via a Sonogashira–Hagihara cross-coupling reaction of a BODIPY derivative with triple polymerisable groups and a range of aryl–alkyne monomers. All of the polymers show high isosteric heats of CO₂ adsorption (23.3–27.3 kJ mol⁻¹) because the incorporation of heteroatoms (N, B, F) from the BODIPY unit into the polymer skeleton enhanced the binding affinity between the pore wall and CO₂ molecules. The aryl–alkyne monomer has a large influence on the surface area and CO₂ adsorption performance of the resulting polymers. The polymer BDPCMP-3 shows a high Brunauer–Emmett–Teller specific surface area of up to 725 m² g⁻¹, while BDPCMP-2 with a low surface area of 582 m² g⁻¹ shows a high CO₂ uptake ability of 2.25 mmol g⁻¹ at 1.13 bar/273 K with a CO₂/N₂ adsorption selectivity of 32.3.