Abstract <p>Metal complexes have a variety of current applications, including radical-initiated polymerization in the presence of metallocenes, which form active centers of coordination chain propagation. Recently, only styrene and methyl methacrylate radical coordination polymerization have been studied. A DFT study of all potential elementary acts of the radical polymerization vinyl chloride in the presence of ferrocene demonstrates that growth radicals (R<sup>•</sup>) are bound to a ferrocene cyclopentadienyl ligand to form a metal-centered radical (C<sub>5</sub>H<sub>5</sub>R)Fe<sup>•</sup>Cp with a free vacancy on an iron atom. The sequential addition of growth radicals and monomers to intermediate (C<sub>5</sub>H<sub>5</sub>R)Fe<sup>•</sup>Cp leads to the formation of the following coordination chain growth active centers types: (C<sub>5</sub>H<sub>5</sub>R)FeR(M)Cp, R<sub>2</sub>(M)Fe<sup>•</sup>Cp, and (R)M<sub>2</sub>FeCp. The chain propagation proceeds in these active centers without radicals, leading to the formation of a regular “head-to-tail” polymer structure. Notably, this process occurs without chain termination and radicals, a characteristic that allows it to be described as radical coordination polymerization.</p>

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Ferrocene in Radical Coordination Polymerization of Vinyl Chloride: a DFT Study

  • A. V. Smirnov,
  • D. R. Diniakhmetova,
  • S. V. Kolesov

摘要

Abstract

Metal complexes have a variety of current applications, including radical-initiated polymerization in the presence of metallocenes, which form active centers of coordination chain propagation. Recently, only styrene and methyl methacrylate radical coordination polymerization have been studied. A DFT study of all potential elementary acts of the radical polymerization vinyl chloride in the presence of ferrocene demonstrates that growth radicals (R) are bound to a ferrocene cyclopentadienyl ligand to form a metal-centered radical (C5H5R)FeCp with a free vacancy on an iron atom. The sequential addition of growth radicals and monomers to intermediate (C5H5R)FeCp leads to the formation of the following coordination chain growth active centers types: (C5H5R)FeR(M)Cp, R2(M)FeCp, and (R)M2FeCp. The chain propagation proceeds in these active centers without radicals, leading to the formation of a regular “head-to-tail” polymer structure. Notably, this process occurs without chain termination and radicals, a characteristic that allows it to be described as radical coordination polymerization.