title: A dinuclear cobalt complex featuring unprecedented anodic and cathodic redox switches for single-molecule magnet activity.
abstract: One-electron oxidation or reduction of the paramagnetic dinuclear Co(II) complex dmp2Nin{Co[N(SiMe3)2]}2 (1; dmp2Nin(2-) = bis(2,6-dimethylphenyl)nindigo), by fully reversible chemical or electrochemical methods, generates the radical salts [1(OEt2)](+) and [1](-), respectively. Full structural and magnetic analyses reveal the locus of the redox changes to be nindigo-based, thus giving rise to ligand-centered radicals sandwiched between two paramagnetic and low-coordinate Co(II) centers. The presence of these sandwiched radicals mediates magnetic coupling between the high-spin (S = 3/2) cobalt ions, which gives rise to single-molecule magnet (SMM) activity in both the oxidized ([1(OEt2)](+)) and reduced ([1](-)) states. This feature represents the first example of a SMM exhibiting fully reversible, dual "ON/OFF" switchability in both the cathodic and anodic states.
authors.affiliation: Department of Chemistry, Indiana University , 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States.
authors.forename: Skye
authors.initials: S
authors.lastname: Fortier
authors.forename: Jennifer J
authors.initials: JJ
authors.lastname: Le Roy
authors.forename: Chun-Hsing
authors.initials: CH
authors.lastname: Chen
authors.forename: Veacheslav
authors.initials: V
authors.lastname: Vieru
authors.forename: Muralee
authors.initials: M
authors.lastname: Murugesu
authors.forename: Liviu F
authors.initials: LF
authors.lastname: Chibotaru
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Mindiola
authors.forename: Kenneth G
authors.initials: KG
authors.lastname: Caulton