title: Helical Folding-Induced Stabilization of Ferromagnetic Polyradicals Based on Triarylmethyl Radical Derivatives.
abstract: Magnetic ordering in purely organic π-conjugated materials is a challenging, rare, and desirable event. The interest lies on the unique magnetic properties derived from high-spin carbon-based polymers/macromolecules tailored through appropriate synthetic routes. Ground-breaking achievements have been reported regarding magnetic ordering in an organic polymer using spin clusters as building blocks. This strategy leads to two-dimensional extended polyradicals with a concomitant loss of appealing macroscopic properties such as expected magnetic anisotropy in elongated shaped macromolecules containing carbon-bearing radicals. Here we provide compelling evidence of a secondary structure-induced stabilization of ferromagnetic polyradicals with robust magnetic properties and strongly suggest revisiting a discarded attempt to obtain polymeric linear-like radicals. An alternative synthetic approach is also proposed, based on polyradicals obtained from discrete molecular precursors (oligomers) long enough to ensure a secondary structure, rather than from polymerization processes.
authors.affiliation: Departament de Química Física & Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona , C/Martí i Franquès 1, 08028 Barcelona, Spain.
authors.forename: Daniel
authors.initials: D
authors.lastname: Reta Mañeru
authors.affiliation: Departament de Química Física & Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona , C/Martí i Franquès 1, 08028 Barcelona, Spain.
authors.forename: Ibério de P R
authors.initials: Ide P
authors.lastname: Moreira
authors.affiliation: Departament de Química Física & Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona , C/Martí i Franquès 1, 08028 Barcelona, Spain.
authors.forename: Francesc
authors.initials: F
authors.lastname: Illas
mesh_terms: D006838:Hydrocarbons / Q000737:chemistry; D059346:Magnets / Q000737:chemistry*; D008956:Models, Chemical; D015394:Molecular Structure; D011108:Polymers / Q000737:chemistry*
chemical_list: D006838:Hydrocarbons; D011108:Polymers