Synthesis, characterization, and ion-complexing properties of polymers displaying densely packed arrays of crown-ethers as lateral substituents
Résumé
We report the synthesis and ion-binding properties of four poly(crown-ethers) displaying either one or two crown ethers (15-crown-5 or 18-crown-6) on every third carbon along- side the backbone. The polymers were synthesized by living anionic ring-opening polymerization of disubstituted cyclopropane- 1,1-dicarboxylates monomers. Cation binding of the polychelating polymers and corresponding monomers to Na+ and K+ was evaluated by picrate extraction and isothermal calorimetry titration. This novel family of poly(crown-ethers) demonstrated excellent initial binding of the alkali ions to the polymers, with a higher selectivity for potassium.