title: Stable NiIIPorphyrin meso-Oxy Radical with a Quartet Ground State.
abstract: 10,15,20-Tris(pentafluorophenyl)-substituted NiII-porphyrin meso-oxy radical bearing two coordinating pyridines was synthesized as a stable radical with a quartet ground state (S=3/2). X-ray structural analysis revealed that the NiIIporphyrin moiety is fairly planar and the Ni-N bond lengths are considerably longer, indicating the high-spin state of the NiIIcenter. The radical exhibited a quartet ground state, indicating the ferromagnetic interaction between the high-spin NiIIcenter (S=1) and the porphyrin meso-oxy radical (S=1/2).
authors.affiliation: Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel, Otto-Hahn-Platz 4, Kiel, 24098, Germany.
authors.forename: Cosima
authors.initials: C
authors.lastname: Stähler
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.
authors.forename: Daiki
authors.initials: D
authors.lastname: Shimizu
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.
authors.forename: Kota
authors.initials: K
authors.lastname: Yoshida
authors.affiliation: Center for Instrumental Analysis, Institute for Research Promotion, Niigata University, Nishi-ku, Niigata, 950-2181, Japan.
authors.forename: Ko
authors.initials: K
authors.lastname: Furukawa
authors.affiliation: Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel, Otto-Hahn-Platz 4, Kiel, 24098, Germany.
authors.forename: Rainer
authors.initials: R
authors.lastname: Herges
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.
authors.forename: Atsuhiro
authors.identifier: http://orcid.org/0000-0001-8697-8488
authors.initials: A
authors.lastname: Osuka
keywords: magnetism; nickel; porphyrins; spin crossover; stable radicals