Selective Metal‐Complexation on Polymeric Templates and Their Investigation via Isothermal Titration Calorimetry. Issue 23 (16th September 2021)

• Record Type: Journal Article
• Authors: Bätz, Thomas; Enke, Marcel; Zechel, Stefan; Hager, Martin D.; Schubert, Ulrich S.
• Is Part Of: Macromolecular chemistry and physics. Volume 222:Issue 23(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-09-16
• Subjects: isothermal titration calorimetry -- metallopolymers -- selective complexation -- supramolecular polymers; Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.202100295
• Languages: English
• ISSNs: 1022-1352

Abstract

Abstract: Selective complexation of metal ions represents a powerful tool for the development of versatile supramolecular architectures. While research in the field of molecular devices and machinery is sophisticated, the selective formation of metal complexes is not prevalent in polymer chemistry. Thus, the implementation of orthogonal binding concepts into a polymeric matrix is presented. In this context, an end‐functionalized poly( N ‐isopropylacrylamide) (PNIPAm) carrying zinc‐porphyrin (ZnTPP) as well as a terpyridine (tpy) ligand side by side is utilized. With these binding sites, the polymer can simultaneously interact with a pyridine moiety via a ZnTPP interaction and a terpyridine unit by the formation of a bis‐terpyridine complex. The complexation behavior of this polymer and different model compounds is intensively investigated by isothermal titration calorimetry. The obtained results indicate that the reported orthogonality of these two systems is successfully transferred into a functional polymeric architecture. Abstract : A polymeric template based on a poly( N ‐isopropylacrylamide) (PNIPAm) backbone and different ligand moieties is synthesized. The binding sites terpyridine and zinc‐porphyrin enable the selective complexation and binding of competing ligands. The synthesized polymer as well as model systems are investigated via isothermal titration calorimetry. The results reveal that the orthogonal and selective binding concept can be transferred into a polymeric environment.