title: A Ring-Opening Metathesis Polymerization Catalyst That Exhibits Redox-Switchable Monomer Selectivities.
abstract: A ring-opening metathesis polymerization catalyst supported by a redox-active N-heterocyclic carbene was synthesized and found to undergo reversible reduction. In its neutral form, the catalyst polymerized 1,5-cis,cis-cyclooctadiene at a higher rate than that of a norbornene derivative; however, upon reduction, the selectivity was found to reverse. Utilizing this oxidation state dependent selectivity, a series of copolymers with controlled compositions, microstructures, and physical properties were prepared by redox-switching the catalyst over the course of a series of polymerization reactions.
authors.affiliation: Department of Chemistry, The University of Texas at Austin, 1 University Station, A1590, Austin, TX, 78712, USA.|Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea.
authors.forename: Dominika N
authors.initials: DN
authors.lastname: Lastovickova
authors.affiliation: Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA.
authors.forename: Huiling
authors.initials: H
authors.lastname: Shao
authors.affiliation: Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA.
authors.forename: Gang
authors.initials: G
authors.lastname: Lu
authors.affiliation: Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA.|Department of Chemical and Petroleum Engineering, University of Pittsburgh, 3700 O'Hara Street, Pittsburgh, PA, 15261, USA.
authors.forename: Peng
authors.initials: P
authors.lastname: Liu
authors.affiliation: Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea.|Department of Chemistry and Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.
authors.forename: Christopher W
authors.identifier: http://orcid.org/0000-0002-0520-1982
authors.initials: CW
authors.lastname: Bielawski
keywords: N-heterocyclic carbene; olefin metathesis; polymerization; redox; switchable