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On Approaching the Limit of Molecular Magnetic Anisotropy: A Near‐Perfect Pentagonal Bipyramidal Dysprosium(III) Single‐Molecule Magnet
Author(s) -
Ding YouSong,
Chilton Nicholas F.,
Winpenny Richard E. P.,
Zheng YanZhen
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201609685
Subject(s) - dysprosium , pentagonal bipyramidal molecular geometry , chemistry , crystallography , magnetization , magnetic anisotropy , single molecule magnet , anisotropy , magnet , relaxation (psychology) , magnetic relaxation , pyridine , molecule , lanthanide , condensed matter physics , magnetic field , inorganic chemistry , crystal structure , physics , social psychology , psychology , ion , organic chemistry , quantum mechanics , medicinal chemistry
We report a monometallic dysprosium complex, [Dy(O t Bu) 2 (py) 5 ][BPh 4 ] ( 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 [Tb 2 N 2 {N(SiMe 3 ) 2 } 4 (THF) 2 ].
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