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Main‐Chain Supramolecular Polymers Based on Orthogonal Benzo‐21‐Crown‐7/Secondary Ammonium Salt and Terpyridine/Metal Ion Recognition Motifs
Authors:Yu‐Kui Tian  Feng Wang
Abstract:Orthogonal self‐assembly of multiple components represents an efficient strategy to afford hierarchical and multifunctional assemblies. Here, we demonstrate the orthogonal recognition behaviors between benzo‐21‐crown‐7/secondary ammonium salt and terpyridine/metal ions (Fe2+ or Zn2+) recognition motifs. Main‐chain supramolecular polymers are subsequently achieved via “one‐pot” mixing of the three monomers together (heteroditopic monomer 1 , homoditopic secondary ammonium salt monomer 2, and Fe(BF4)2•6H2O or Zn(OTf)2), which are confirmed by 1H NMR, UV–Vis, DOSY, and viscosity measurements. Moreover, different metal ions (Fe2+ or Zn2+) exert considerable effects on the size of the resulting supramolecular polymers. Integration of two different types of non‐covalent interactions renders dynamic and responsive properties for the resulting supramolecular polymers, as triggered by a variety of external stimuli such as temperature, potassium cation, as well as stronger chelating ligands. Therefore, the current work is a prerequisite for the future application of such orthogonal assemblies as intelligent supramolecular materials.
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Keywords:host–  guest interactions  metal–  ligand interactions  orthogonality  stimuli‐responsiveness  supramolecular polymers
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