Single-chain magnet behavior in a finite linear hexanuclear molecule

The careful monitoring of crystallization conditions of a mixture made of a Tb III building block and a substituted nitronyl-nitroxide that typically provides infinite coordination polymers ( chains ), affords a remarkably stable linear hexanuclear molecule made of six Tb III ions and five NIT radic...

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Bibliographic Details
Published in:Chemical science (Cambridge) 2021-08, Vol.12 (31), p.1613-1621
Main Authors: Houard, Felix, Gendron, Frederic, Suffren, Yan, Guizouarn, Thierry, Dorcet, Vincent, Calvez, Guillaume, Daiguebonne, Carole, Guillou, Olivier, Le Guennic, Boris, Mannini, Matteo, Bernot, Kevin
Format: Article
Language:English
Subjects:
Antiferromagnetism
Chemical Sciences
Chemistry
Coercivity
Coordination polymers
Coupling (molecular)
Crystallization
Crystallography
Data storage
Hysteresis
Low temperature
Magnetic induction
Magnetic relaxation
Magnets
Water chemistry
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Summary:The careful monitoring of crystallization conditions of a mixture made of a Tb III building block and a substituted nitronyl-nitroxide that typically provides infinite coordination polymers ( chains ), affords a remarkably stable linear hexanuclear molecule made of six Tb III ions and five NIT radicals. The hexanuclear units are double-bridged by water molecules but ab initio calculations demonstrate that this bridge is inefficient in mediating any magnetic interaction other than a small dipolar antiferromagnetic coupling. Surprisingly the hexanuclears , despite being finite molecules, show a single-chain magnet (SCM) behavior. This results in a magnetic hysteresis at low temperature whose coercive field is almost doubled when compared to the chains . We thus demonstrate that finite linear molecules can display SCM magnetic relaxation, which is a strong asset for molecular data storage purposes because 1D magnetic relaxation is more robust than the relaxation mechanisms observed in single-molecule magnets (SMMs) where under-barrier magnetic relaxation can operate. A stable hexanuclear molecule made of a Tb III building block and a substituted nitronyl-nitroxide radical show a single-chain magnet behavior despite being a finite molecule.
ISSN:2041-6520
2041-6539
DOI:10.1039/d1sc02033a