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Single-Chain Self-Folding of Synthetic Polymers Induced by Metal–Ligand Complexation

Authors

  • Johannes Willenbacher,

    1. Preparative Macromolecular Chemistry, Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
    2. Institut für Biologische Grenzflächen, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany
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  • Ozcan Altintas,

    1. Preparative Macromolecular Chemistry, Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
    2. Institut für Biologische Grenzflächen, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany
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  • Peter W. Roesky,

    1. Institut für Anorganische Chemie, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
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  • Christopher Barner-Kowollik

    Corresponding author
    1. Preparative Macromolecular Chemistry, Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
    2. Institut für Biologische Grenzflächen, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany
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Abstract

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The controlled folding of a single polymer chain is for the first time realized by metal- complexation. α,ω-Bromine functional linear polymers are prepared via activators regenerated by electron transfer (ARGET) ATRP (math formula,SEC = 5900 g mol−1, Đ = 1.07 and 12 000 g mol−1, Đ = 1.06) and the end groups of the polymers are subsequently converted to azide functionalities. A copper-catalyzed azide–alkyne cycloaddition (CuAAC) reaction is carried out in the presence of a novel triphenylphosphine ligand and the polymers to afford homotelechelic bis-triphenylphosphine polymeric-macroligands (MLs) (math formula,SEC = 6600 g mol−1, Đ = 1.07, and 12 800 g mol−1, Đ = 1.06). Single-chain metal complexes (SCMCs) are formed in the presence of Pd(II) ions in highly diluted solution at ambient temperature. The results derived via 1H and 31P{1H} NMR experiments, SEC, and DLS unambiguously evidence the efficient formation of SCMCs via metal ligand complexation.

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