Mixed‐Valence o‐Iminobenzoquinone and o‐Iminobenzosemiquinonate Anion Radical Complexes of Cobalt: Valence Tautomerism

Abstract

Abstract:2

Room Temperature Magnetic Switchability Assisted by Hysteretic Valence Tautomerism in a Layered Two-Dimensional Manganese-Radical Coordination Framework

“…In this redox process, the Co­(III) ion is reduced to Co­(II) and the CAT ligand is oxidized to its semiquinonato (SQ) form. VT transitions involving SQ-CAT ligand are by far the most reported in the literature, mainly in Co, − and Mn isolated complexes, − but also in various d block elements such as Fe, Ni, Rh, and V. − VT transitions were also observed in four unidimensional (1D) polymers and one Co-based bidimensional (2D) coordination polymer. ,− Other ligands than SQ-CAT are less common in VT systems, with a dozen examples reported so far, involving porphyrin derivatives, cyclopentadienyl, or bis­(diisopropyl-phenylimino)­acenaphthene. − In the latter case, VT was reported for Yb …”

Cobalt-Catalyzed Aerobic Oxidative Cyclization of 2-Aminophenols with Isonitriles: 2-Aminophenol Enabled O2 Activation by Cobalt(II)

“…A large series of Co II complexes of aminophenol-, aminothiophenol-, and diamine-derived ligands have been characterized, , and Wieghardt and coworkers have shown the aerobic oxidation of these species to form stabilized iminobenzosemiquinonato-type species bearing π-radical ligands (AP SQ ) . In all of these cases, highly substituted aminophenol ligands are used to avoid ligand dimerization and enable the isolation of the oxidized complexes.…”