Strong Exchange Couplings Drastically Slow Down Magnetization Relaxation in an Air‐Stable Cobalt(II)‐Radical Single‐Molecule Magnet (SMM)

The energy barrier leading to magnetic bistability in molecular clusters is determined by the magnetic anisotropy of the cluster constituents. By incorporating a highly anisotropic four‐coordinate cobalt(II) building block into a strongly coupled fully air‐ and moisture‐stable three‐spin system, it...

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Veröffentlicht in:Angewandte Chemie International Edition Jg. 58; H. 29; S. 9802 - 9806
Hauptverfasser: Albold, Uta, Bamberger, Heiko, Hallmen, Philipp P., van Slageren, Joris, Sarkar, Biprajit
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Germany Wiley Subscription Services, Inc 15.07.2019
John Wiley and Sons Inc
Ausgabe:International ed. in English
Schlagworte:
Anisotropy
Bistability
Cobalt
Communication
Communications
Coupling (molecular)
Couplings
hysteresis
Low temperature
Magnetic anisotropy
Magnetization
Molecular clusters
molecular magnetism
Raman process
Relaxation time
single-molecule magnet
molecular magnetism
cobalt
single-molecule magnet
Raman process
hysteresis
ISSN:1433-7851, 1521-3773, 1521-3773
Online-Zugang:Volltext
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Zusammenfassung:The energy barrier leading to magnetic bistability in molecular clusters is determined by the magnetic anisotropy of the cluster constituents. By incorporating a highly anisotropic four‐coordinate cobalt(II) building block into a strongly coupled fully air‐ and moisture‐stable three‐spin system, it proved possible to suppress under‐barrier Raman processes leading to 350‐fold increase of magnetization relaxation time and pronounced hysteresis. Relaxation times of up to 9 hours at low temperatures were found. A Co production: The energy barrier leading to magnetic bistability in molecular clusters is determined by the magnetic anisotropy of the cluster constituents. By incorporating a highly anisotropic four‐coordinate cobalt(II) building block into a strongly coupled three‐spin system, it proved possible to increase the magnetization relaxation time by a factor of 350 to almost 9 hours at low temperatures.
Bibliographie:These authors contributed equally to this work.
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ISSN:1433-7851
1521-3773
1521-3773
DOI:10.1002/anie.201904645