Rare cases of genuine (i.e. field-free) SMM have been found for mixed 3d–4f–5d ring-shaped compounds with Tb(III) (Ueff/kB = 23.0 K) or Dy(III) (Ueff/kB = 26.4 K). The ferromagnetic interactions between the transition metals are shown to play an essential role in this feature.
![Graphical abstract: On the importance of ferromagnetic exchange between transition metals in field-free SMMs: examples of ring-shaped hetero-trimetallic [(LnNi2){W(CN)8}]2 compounds](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C5CC01743B&imageInfo.ImageIdentifier.Year=2015)
S. Dhers, J. Costes, P. Guionneau, C. Paulsen, L. Vendier and J. Sutter, Chem. Commun., 2015, 51, 7875 DOI: 10.1039/C5CC01743B
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