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Importance of an Axial Ln<sup>III</sup>-F Bond across the Lanthanide Series and Single-Molecule Magnet Behavior in the Ce and Nd Analogues
Journal
Inorganic Chemistry
ISSN
00201669
Date Issued
2022-07-04
Author(s)
Regincós Martí, Emma
Canaj, Angelos B.
Sharma, Tanu
Celmina, Anna
Wilson, Claire
Rajaraman, Gopalan
Murrie, Mark
Abstract
The recently reported compound [DyIIILF](CF3SO3)2·H2O (L = 1,4,7,10-tetrakis(2-pyridylmethyl)-1,4,7,10-tetraaza-cyclododecane) displays a strong axial magnetic anisotropy, due to the short axial Dy-F bond, and single-molecule magnet (SMM) behavior. Following our earlier [DyIIILF]2+work, herein we report the systematic structural and magnetic study of a family of [LnIIILF](CF3SO3)2·H2O compounds (Ln(III) = 1-Ce, 2-Pr, 3-Nd, 4-Eu, 5-Tb, 6-Ho, 7-Er, 8-Tm, and 9-Yb). From this series, the Ce(III) and Nd(III) analogues show slow relaxation of the magnetization under an applied direct current magnetic field, which is modeled using a Raman process. Complete active space self-consistent field theoretical calculations are employed to understand the relaxation pathways in 1-Ce and 3-Nd and also reveal a large tunnel splitting for 5-Tb. Additional computational studies on model compounds where we remove the axial F-ligand, or replace F-with I-, highlight the importance of the F-ligand in creating a strong axial crystal field for 1-Ce and 3-Nd and for promoting the SMM behavior. Importantly, this systematic study provides insight into the magnetic properties of these lighter lanthanide ions.
Volume
61
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