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A Low-Symmetry Dysprosium Metallocene Single-Molecule Magnet with a High Anisotropy Barrier
Ist Teil von
Angewandte Chemie (International ed.), 2016-09, Vol.55 (37), p.11082-11085
Auflage
International ed. in English
Ort / Verlag
Germany: Blackwell Publishing Ltd
Erscheinungsjahr
2016
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The single‐molecule magnet (SMM) properties of the isocarbonyl‐ligated dysprosium metallocene [Cp*2Dy{μ‐(OC)2FeCp}]2 (1Dy), which contains a rhombus‐shaped Dy2Fe2 core, are described. Combining a strong axial [Cp*]− ligand field with a weak equatorial field consisting of the isocarbonyl ligands leads to an anisotropy barrier of 662 cm−1 in zero applied field. The dominant thermal relaxation pathways in 1Dy involves at least the fourth‐excited Kramers doublet, thus demonstrating that prominent SMM behavior can be observed for dysprosium in low‐symmetry environments.
Kramers vs. Kramers: An isocarbonyl‐ligated dysprosium metallocene single‐molecule magnet (SMM) is designed and synthesized using a magnetostructural correlation. The SMM has a very large barrier of 662 cm−1, with magnetization reversal occurring via the fourth‐, fifth‐, and sixth‐excited Kramers doublets.