First Demonstration of Magnetoelectric Coupling in a Polynuclear Molecular Nanomagnet: Single‐Crystal EPR Studies of [Fe3O(O2CPh)6(py)3]ClO4⋅py under Static Electric Fields

Single‐crystal EPR experiments show that the highly symmetric antiferromagnetic half‐integer spin triangle [Fe3O(O2CPh)6(py)3]ClO4⋅py (1, py=pyridine) possesses a ST=1/2 ground state exhibiting high g‐anisotropy due to antisymmetric exchange (Dzyaloshinskii–Moriya) interactions. EPR experiments unde...

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Vydáno v:Chemistry : a European journal Ročník 24; číslo 56; s. 14896 - 14900
Hlavní autoři: Boudalis, Athanassios K., Robert, Jérôme, Turek, Philippe
Médium: Journal Article
Jazyk:angličtina
Vydáno: Weinheim Wiley Subscription Services, Inc 09.10.2018
Wiley-VCH Verlag
Témata:
Anisotropy
Antiferromagnetism
Chemical Sciences
Chemistry
Chirality
Coupling (molecular)
Electric fields
EPR spectroscopy
Ground state
Magnetic resonance
Material chemistry
molecular nanomagnets
Pyridines
spin chirality
spin triangles
spin-electric coupling
ISSN:0947-6539, 1521-3765
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Shrnutí:Single‐crystal EPR experiments show that the highly symmetric antiferromagnetic half‐integer spin triangle [Fe3O(O2CPh)6(py)3]ClO4⋅py (1, py=pyridine) possesses a ST=1/2 ground state exhibiting high g‐anisotropy due to antisymmetric exchange (Dzyaloshinskii–Moriya) interactions. EPR experiments under static electric fields parallel to the triangle's plane (i.e., perpendicular to the magnetic z‐axis) reveal that this ground state couples to externally applied electric fields. This magnetoelectric coupling causes an increase in the intensity of the intradoublet EPR transition and does not affect its resonance position when B0∥z. The results are discussed on the basis of theoretical models correlating the spin chirality of the ground state with the magnetoelectric effect. Clear! An electric field applied on the antiferromagnetic spin‐chiral complex [Fe3O(O2CPh)6(py)3]ClO4⋅py couples to the spin of its ground state and modifies its Electron Paramagnetic Resonance (EPR) spectrum. This magnetoelectric coupling can provide electric control of the spin states of Molecular Nanomagnets.
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ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201803038