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On Approaching the Limit of Molecular Magnetic Anisotropy: A Near-Perfect Pentagonal Bipyramidal Dysprosium(III)
You-Song Ding1, Nicholas F Chilton2, Richard E P Winpenny2
1Frontier 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.
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 ].
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