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

You-Song Ding; Nicholas F Chilton; Richard E P Winpenny; Yan-Zhen Zheng

doi:10.1002/anie.201609685

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

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

Authors

You-Song Ding¹, Nicholas F Chilton², Richard E P Winpenny², Yan-Zhen Zheng¹

Affiliations

¹ Frontier Institute of Science and Technology (FIST), State Key Laboratory of Mechanical Behavior of Materials and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an, 710054, P.R. China.
² The School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.

PMID: 27874236
DOI: 10.1002/anie.201609685

Abstract

We report a monometallic dysprosium complex, [Dy(O^t Bu)₂ (py)₅ ][BPh₄ ] (5), that shows the largest effective energy barrier to magnetic relaxation of U_eff =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, T_B , 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.

Publication types

Research Support, Non-U.S. Gov't