A Trigonal-Pyramidal Erbium(III) Single-Molecule Magnet

Given the recent advent of mononuclear single‐molecule magnets (SMMs), a rational approach based on lanthanides with axially elongated f‐electron charge cloud (prolate) has only recently received attention. We report herein a new SMM, [Li(THF)4[Er{N(SiMe3)2}3Cl]⋅2 THF, which exhibits slow relaxation...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2015-05, Vol.54 (20), p.5864-5868
Main Authors: Brown, Andrew J., Pinkowicz, Dawid, Saber, Mohamed R., Dunbar, Kim R.
Format: Article
Language:English
Subjects:
Elongation
erbium
Hysteresis
Lanthanides
Ligands
Magnetic fields
magnetic hysteresis
Magnetic permeability
Magnetic properties
Magnetization
mononuclear
prolate lanthanides
Riding
single-molecule magnets
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Summary:Given the recent advent of mononuclear single‐molecule magnets (SMMs), a rational approach based on lanthanides with axially elongated f‐electron charge cloud (prolate) has only recently received attention. We report herein a new SMM, [Li(THF)4[Er{N(SiMe3)2}3Cl]⋅2 THF, which exhibits slow relaxation of the magnetization under zero dc field with an effective barrier to the reversal of magnetization (ΔEeff/kB=63.3 K) and magnetic hysteresis up to 3 K at a magnetic field sweep rate of 34.6 Oe s−1. This work questions the theory that oblate or prolate lanthanides must be stabilized with the appropriate ligand framework in order for SMM behavior to be favored. Riding the wave of erbium SMMs: The first trigonal pyramidal mononuclear erbium(III) single‐molecule magnet (SMM) was synthesized and its magnetic properties investigated. Despite containing an axial Cl− ligand, which is expected to reduce the prolate nature of the erbium(III) ion, the molecule exhibits out‐of‐phase signals in the ac susceptibility data in the absence of an external field and hysteresis behavior up to 3 K.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201411190