title: Adding remnant magnetization and anisotropic exchange to propeller-like single-molecule magnets through chemical design.
abstract: The selective replacement of the central iron(III) ion with vanadium(III) in a tetrairon(III) propeller-shaped single-molecule magnet has allowed us to increase the ground spin state from S=5 to S=13/2. As a consequence of the pronounced anisotropy of vanadium(III), the blocking temperature for the magnetization has doubled. Moreover, a significant remnant magnetization, practically absent in the parent homometallic molecule, has been achieved owing to the suppression of zero-field tunneling of the magnetization for the half-integer molecular spin. Interestingly, the contribution of vanadium(III) to the magnetic anisotropy barrier occurs through the anisotropic exchange interaction with iron(III) spins and not through single ion anisotropy as in most single-molecule magnets.
authors.affiliation: Departamento de Química, Universidade Federal do Paraná, Centro Politécnico, 81530-900, Curitiba-PR (Brazil).
authors.forename: Kátia Cristina M
authors.initials: KC
authors.lastname: Westrup
authors.forename: Marie-Emmanuelle
authors.initials: ME
authors.lastname: Boulon
authors.forename: Pasquale
authors.initials: P
authors.lastname: Totaro
authors.forename: Giovana G
authors.initials: GG
authors.lastname: Nunes
authors.forename: Davi F
authors.initials: DF
authors.lastname: Back
authors.forename: Andersson
authors.initials: A
authors.lastname: Barison
authors.forename: Martin
authors.initials: M
authors.lastname: Jackson
authors.forename: Carley
authors.initials: C
authors.lastname: Paulsen
authors.forename: Dante
authors.initials: D
authors.lastname: Gatteschi
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Sorace
authors.forename: Andrea
authors.initials: A
authors.lastname: Cornia
authors.forename: Jaísa F
authors.initials: JF
authors.lastname: Soares
authors.forename: Roberta
authors.initials: R
authors.lastname: Sessoli
keywords: iron; magnetic anisotropy; molecular magnetism; single-molecule magnets; vanadium