title: On Approaching the Limit of Molecular Magnetic Anisotropy: A Near-Perfect Pentagonal Bipyramidal Dysprosium(III) Single-Molecule Magnet.
abstract: We report a monometallic dysprosium complex, [Dy(OtBu)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 [Tb2N2{N(SiMe3)2}4(THF)2].
authors.affiliation: 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.
authors.forename: You-Song
authors.initials: YS
authors.lastname: Ding
authors.affiliation: The School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
authors.forename: Nicholas F
authors.identifier: 0000-0002-8604-0171
authors.initials: NF
authors.lastname: Chilton
authors.affiliation: The School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
authors.forename: Richard E P
authors.identifier: 0000-0002-7101-3963
authors.initials: RE
authors.lastname: Winpenny
authors.affiliation: 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.
authors.forename: Yan-Zhen
authors.initials: YZ
authors.lastname: Zheng
keywords: dysprosium; magnetic anisotropy; magnetic relaxation; single-molecule magnets