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. 2016 Dec 23;55(52):16071-16074.
doi: 10.1002/anie.201609685. Epub 2016 Nov 22.

On Approaching the Limit of Molecular Magnetic Anisotropy: A Near-Perfect Pentagonal Bipyramidal Dysprosium(III) Single-Molecule Magnet

You-Song Ding  1 , Nicholas F Chilton  2 , Richard E P Winpenny  2 , Yan-Zhen Zheng  1
Affiliations

On Approaching the Limit of Molecular Magnetic Anisotropy: A Near-Perfect Pentagonal Bipyramidal Dysprosium(III) Single-Molecule Magnet

You-Song Ding et al. Angew Chem Int Ed Engl. .

Abstract

We report a monometallic dysprosium complex, [Dy(Ot Bu)2 (py)5 ][BPh4 ] (5), that shows the largest effective energy barrier to magnetic relaxation of Ueff =1815(1) K. The massive magnetic anisotropy is due to bis-trans-disposed tert-butoxide ligands with weak equatorial pyridine donors, approaching proposed schemes for high-temperature single-molecule magnets (SMMs). The blocking temperature, TB , is 14 K, defined by zero-field-cooled magnetization experiments, and is the largest for any monometallic complex and equal with the current record for [Tb2 N2 {N(SiMe3 )2 }4 (THF)2 ].

Keywords: dysprosium; magnetic anisotropy; magnetic relaxation; single-molecule magnets.

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