Macromolecules containing pendent cationic ...

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Title Macromolecules containing pendent cationic cyclopentadienyliron moieties.
Author(s) Alaa S. Abd-El-Aziz, Erin K. Todd, Patrick O. Shipman
Journal Polymer News,
Date 2005
Volume 30
Issue 7
Start page 202
End page 212
Abstract This feature article describes the synthesis of various classes of monomers and polymers incorporating organoiron moieties. Polyethers incorporating η6-substituted-arene-η5-cyclopentadienyliron moieties were synthesized via metal-mediated nucleophilic aromatic substitution reactions. Linear polymers incorporating both cationic and neutral organoiron units were prepared; these polymers underwent two electrochemical processes, oxidation of the neutral iron species occurred between 0.89 and 1.0 V and reduction of the cationic iron groups occurred between −1.10 and −1.45 V. Polynorbornenes, polymethacrylates, and polystyrenes were prepared via radical and condensation polymerization of organoiron functionalized monomers. The incorporation of azo dyes into the polymers gave rise to a variety of colored materials that could be photobleached in the presence of hydrogen peroxide. The incorporation of benzothiazole-based dyes resulted in colored polymers with higher λmax values than azobenzene-based dyes. Photolytic decoordination of the cationic cyclopentadienyliron moieties resulted in the formation of organic analogs or neutral polyferrocenes depending on the nature of the starting polymers. A number of 3-arm star-shaped molecules were also prepared; electrochemical studies showed that the inner and outer iron moieties are reduced at different potentials.
DOI 10.1080/00323910500458542

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