Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 56, Pages 14896-14900Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201803038
Keywords
EPR spectroscopy; molecular nanomagnets; spin chirality; spin triangles; spin-electric coupling
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Funding
- national French EPR network RENARD [IR-RPE CNRS 3443]
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie [746060]
- Marie Curie Actions (MSCA) [746060] Funding Source: Marie Curie Actions (MSCA)
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Single-crystal EPR experiments show that the highly symmetric antiferromagnetic half-integer spin triangle [Fe3O(O2CPh)(6)(py)(3)]ClO4 center dot py (1, py = pyridine) possesses a S-T = 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 B-0 parallel to z. The results are discussed on the basis of theoretical models correlating the spin chirality of the ground state with the magnetoelectric effect.
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