Exploring a Redox-Active Ionic Porous Organic Polymer in Environmental Remediation and Electrochromic Application

Here, we report the design and synthesis of a redox-active multifunctional ionic porous organic polymer iPOP-Bpy with exchangeable Br^- ions, incorporating viologen as a redox-active building block. The material shows not only excellent iodine uptake capacity in the vapor phase (540 wt %) but also in the organic (1009.77 mg g^-1) and aqueous phases (3921.47 mg g^-1) with very fast adsorption kinetics in all cases. The material also shows its utility in being used as a solid-state NH₃ vapor sensor as it shows very fast color switching in the presence of NH₃ vapor. Furthermore, the material found application as a p-type complementary electrochromic electrode and was fabricated into a bilayer device. Excellent coloration efficiency, high switching speed, and good color contrast were obtained as investigated using bias-dependent optical and spectroelectrochemical studies, paving the way for fabricating power-efficient solid-state electrochromic devices.