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Studies from Karlsruhe Institute of Technology Add New Findings in the Area of Supramolecular Research (Redox-Switchable Supramolecular Graft Polymer...

August 29, 2014

Studies from Karlsruhe Institute of Technology Add New Findings in the Area of Supramolecular Research (Redox-Switchable Supramolecular Graft Polymer Formation via Ferrocene-Cyclodextrin Assembly)

By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Supramolecular Research. According to news reporting originating from Eggenstein Leopoldshafen, Germany, by NewsRx correspondents, research stated, "The redox switchable formation of very well-defined supramolecular graft polymers in aqueous solution driven by host-guest interactions between ferrocene (Fc) and cyclodextrin (CD) is presented. The Fc-containing acrylic backbone copolymer (PDMA-stat-Fc) is prepared via reversible addition-fragmentation chain transfer (RAFT) copolymerization of N, N-dimethylacrylamide (DMA) and the novel monomer N-(ferrocenoylmethyl) acrylamide (NFMA)."

Our news editors obtained a quote from the research from the Karlsruhe Institute of Technology, "Via the RAFT process, copolymers containing variable Fc ratios (5-10 mol%) are prepared, affording polymers of molecular masses of close to 11 000 g mol(-1) and molar mass dispersities (D) of 1.2. The beta-cyclodextrin (beta-CD) containing building block is synthesized via RAFT-polymerization, too, in order to afford a polymer with well-defined molecular mass and low dispersity ((M) over bar (n) = 10 300 g mol(-1), D = 1.1), employing a propargyl-functionalized chain transfer agent for the polymerization of N, N-diethylacrylamide (DEA). The polymerization product is subsequently terminated with beta-CD via the regiospecific copper (I)-catalyzed 1,3-cycloaddition (PDEA-beta CD). Host-guest interactions between Fc and CD lead to the formation of supramolecular graft-polymers, verified via nuclear Overhauser enhancement spectroscopy (NOESY). Importantly, their redox-responsive character is clearly confirmed via cyclic voltammetry (CV). The self-assembly of the statistical Fc-containing lateral polymer chain in aqueous solution leads to mono-and multicore micelle-aggregates evidenced via TEM."

According to the news editors, the research concluded: "Only diffused cloud-like, non-spherical nanostructures are observed after addition of PDEA-beta CD (TEM)."

For more information on this research see: Redox-Switchable Supramolecular Graft Polymer Formation via Ferrocene-Cyclodextrin Assembly. Macromolecular Rapid Communications, 2014;35(14):1293-1300. Macromolecular Rapid Communications can be contacted at: Wiley-V C H Verlag Gmbh, Boschstrasse 12, D-69469 Weinheim, Germany. (Wiley-Blackwell -; Macromolecular Rapid Communications -

The news editors report that additional information may be obtained by contacting F. Szillat, Karlsruhe Inst Technol, Inst Biol Grenzflachen, D-76344 Eggenstein Leopoldshafen, Germany. Additional authors for this research include B. Schmidt, A. Hubert, C. Barner-Kowollik and H. Ritter (see also Supramolecular Research).

Keywords for this news article include: Europe, Germany, Nanotechnology, Emerging Technologies, Supramolecular Research, Eggenstein Leopoldshafen

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Source: Science Letter

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