Journal Article10.1021/JACS.6B02638
A Stable Pentagonal Bipyramidal Dy(III) Single-Ion Magnet with a Record Magnetization Reversal Barrier over 1000 K.
Jiang Liu,Yan-Cong Chen,Jun-Liang Liu,Veacheslav Vieru,Liviu Ungur,Liviu Ungur,Jian-Hua Jia,Liviu F. Chibotaru,Yanhua Lan,Wolfgang Wernsdorfer,Song Gao,Xiao-Ming Chen,Ming-Liang Tong +12 more
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TL;DR: Two highly stable and neutral Dy(III) classical coordination compounds with pentagonal bipyramidal local geometry that exhibit SMM behavior are reported.
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Abstract: Single-molecule magnets (SMMs) with a large spin reversal barrier have been recognized to exhibit slow magnetic relaxation that can lead to a magnetic hysteresis loop. Synthesis of highly stable SMMs with both large energy barriers and significantly slow relaxation times is challenging. Here, we report two highly stable and neutral Dy(III) classical coordination compounds with pentagonal bipyramidal local geometry that exhibit SMM behavior. Weak intermolecular interactions in the undiluted single crystals are first observed for mononuclear lanthanide SMMs by micro-SQUID measurements. The investigation of magnetic relaxation reveals the thermally activated quantum tunneling of magnetization through the third excited Kramers doublet, owing to the increased axial magnetic anisotropy and weaker transverse magnetic anisotropy. As a result, pronounced magnetic hysteresis loops up to 14 K are observed, and the effective energy barrier (Ueff = 1025 K) for relaxation of magnetization reached a breakthrough among the SMMs.
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Citations
Magnetic hysteresis and strong ferromagnetic coupling of sulfur-bridged Dy ions in clusterfullerene Dy2S@C82
Denis S. Krylov,Georgios Velkos,Chia-Hsiang Chen,Chia-Hsiang Chen,Bernd Büchner,Aram Kostanyan,Thomas Greber,Stanislav M. Avdoshenko,Alexey A. Popov +8 more
TL;DR: Analysis of the level crossing events for different orientations of a magnetic field showed that even in powder samples, the hysteresis steps caused by quantum tunneling of magnetization can provide precise information on the strength of intramolecular Dy⋯Dy inter-actions.
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Heterometallic hexanuclear Ni4M2 (M = Dy, Y) complexes: structure and single-molecule magnet for the Dy(III) derivative
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