Adding Remnant Magnetization and Anisotropic Exchange to Propeller‐like Single‐Molecule Magnets through Chemical Design |
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| Authors: | Kátia Cristina M. Westrup Dr. Marie‐Emmanuelle Boulon Dr. Pasquale Totaro Dr. Giovana G. Nunes Dr. Davi F. Back Dr. Andersson Barison Dr. Martin Jackson Dr. Carley Paulsen Prof. Dante Gatteschi Dr. Lorenzo Sorace Prof. Andrea Cornia Prof. Jaísa F. Soares Prof. Roberta Sessoli |
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| Affiliation: | 1. Departamento de Química, Universidade Federal do Paraná, Centro Politécnico, 81530‐900, Curitiba‐PR (Brazil);2. Dipartimento di Chimica Ugo Schiff & UdR INSTM, Università degli Studi di Firenze, Via della Lastruccia?3–13, 50019 Sesto Fiorentino (Italy);3. Departamento de Química, Universidade Federal de Santa Maria, Camobi, 97105‐900, Santa Maria‐RS (Brazil);4. Institut Néel CNRS & Université J. Fourier, 25?rue des Martyrs, 38042 Grenoble (France);5. Current address: Faculty of Mathematics and Physics, Charles University, Ke Karlovu?3, 121 16 Prague (Czech Republic);6. Dipartimento di Scienze Chimiche e Geologiche & UdR INSTM, Università degli Studi di Modena e Reggio Emilia, Via G. Campi?183, 41125 Modena (Italy) |
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| 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. |
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| Keywords: | iron magnetic anisotropy molecular magnetism single‐molecule magnets vanadium |
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